diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56fcf27..a8f3835 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Provide `--add-missing-ids` extraction option to update source code with auto-generated identifiers
 - Add `Util\FormatHelper` that provides `getReader()` and `getWriter()` methods
 - Introduce `Format\Format` final static class for format constants
+- Port [@formatjs/icu-messageformat-parser](https://www.npmjs.com/package/@formatjs/icu-messageformat-parser) to FormatPHP (`FormatPHP\Icu\MessageFormat\Parser`)
 
 ### Changed
 
diff --git a/src/Icu/MessageFormat/Parser/Util/AbstractCodePointMatcher.php b/src/Icu/MessageFormat/Parser/Util/AbstractCodePointMatcher.php
deleted file mode 100644
index c656ba1..0000000
--- a/src/Icu/MessageFormat/Parser/Util/AbstractCodePointMatcher.php
+++ /dev/null
@@ -1,44 +0,0 @@
-<?php
-
-/**
- * This file is part of skillshare/formatphp
- *
- * skillshare/formatphp is open source software: you can distribute
- * it and/or modify it under the terms of the MIT License
- * (the "License"). You may not use this file except in
- * compliance with the License.
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * permissions and limitations under the License.
- *
- * @copyright Copyright (c) Skillshare, Inc. <https://www.skillshare.com>
- * @license https://opensource.org/licenses/MIT MIT License
- */
-
-declare(strict_types=1);
-
-namespace FormatPHP\Icu\MessageFormat\Parser\Util;
-
-use function in_array;
-
-/**
- * @internal
- */
-abstract class AbstractCodePointMatcher implements CodePointMatcherInterface
-{
-    /**
-     * @return int[]
-     */
-    abstract protected function getCodePoints(): array;
-
-    /**
-     * Checks whether the code point matches a set of known code points
-     */
-    public function matches(int $codepoint): bool
-    {
-        return in_array($codepoint, $this->getCodePoints(), true);
-    }
-}
diff --git a/src/Icu/MessageFormat/Parser/Util/CodePointHelper.php b/src/Icu/MessageFormat/Parser/Util/CodePointHelper.php
index 404de34..5b8d11f 100644
--- a/src/Icu/MessageFormat/Parser/Util/CodePointHelper.php
+++ b/src/Icu/MessageFormat/Parser/Util/CodePointHelper.php
@@ -30,6 +30,8 @@
 use function mb_ord;
 
 /**
+ * A helper for working with code points
+ *
  * @internal
  */
 class CodePointHelper
@@ -49,32 +51,61 @@ public function __construct()
         $this->isPotentialElementNameChar = new IsPotentialElementNameChar();
     }
 
+    /**
+     * Checks whether a code point is an alphabet character
+     *
+     * @see IsAlpha::matches()
+     */
     public function isAlpha(int $codepoint): bool
     {
         return $this->isAlpha->matches($codepoint);
     }
 
+    /**
+     * Checks whether a code point is an alphabet character or a forward slash ("/")
+     *
+     * @see IsAlpha::matches()
+     */
     public function isAlphaOrSlash(int $codepoint): bool
     {
-        return $this->isAlpha->matchesWithSlash($codepoint);
+        return $codepoint === 0x002f || $this->isAlpha->matches($codepoint);
     }
 
+    /**
+     * Checks whether a code point is in the Unicode Character Database
+     * White_Space and Pattern_White_Space groups
+     *
+     * @see IsWhiteSpace::matches()
+     */
     public function isWhiteSpace(int $codepoint): bool
     {
         return $this->isWhiteSpace->matches($codepoint);
     }
 
+    /**
+     * Checks whether a code point is in the Unicode Character Database
+     * Pattern_Syntax group
+     *
+     * @see IsPatternSyntax::matches()
+     */
     public function isPatternSyntax(int $codepoint): bool
     {
         return $this->isPatternSyntax->matches($codepoint);
     }
 
+    /**
+     * Checks whether the code point could be used in an HTML tag element name
+     *
+     * @see IsPotentialElementNameChar::matches()
+     */
     public function isPotentialElementNameChar(int $codepoint): bool
     {
         return $this->isPotentialElementNameChar->matches($codepoint);
     }
 
     /**
+     * Returns the code point for a character in a string array at a given offset
+     *
      * @param string[] $stringArray
      */
     public function charCodeAt(array $stringArray, int $offset): ?int
@@ -92,6 +123,9 @@ public function charCodeAt(array $stringArray, int $offset): ?int
         return null;
     }
 
+    /**
+     * Returns the string character for a given code point
+     */
     public function fromCharCode(int $code): ?string
     {
         $char = mb_chr($code, Parser::ENCODING);
@@ -104,6 +138,8 @@ public function fromCharCode(int $code): ?string
     }
 
     /**
+     * Returns a string of characters for the given code points
+     *
      * @throws InvalidUtf8CodePointException
      */
     public function fromCodePoint(int ...$codePoints): string
diff --git a/src/Icu/MessageFormat/Parser/Util/IsAlpha.php b/src/Icu/MessageFormat/Parser/Util/IsAlpha.php
index 73600e6..9817c6b 100644
--- a/src/Icu/MessageFormat/Parser/Util/IsAlpha.php
+++ b/src/Icu/MessageFormat/Parser/Util/IsAlpha.php
@@ -23,85 +23,19 @@
 namespace FormatPHP\Icu\MessageFormat\Parser\Util;
 
 /**
+ * Checks whether a code point is an alphabet character
+ *
  * @internal
  */
-class IsAlpha extends AbstractCodePointMatcher
+class IsAlpha implements CodePointMatcherInterface
 {
     /**
-     * Latin alphabet code points
-     *
-     * This array provides fast lookup of values.
-     */
-    protected const CODE_POINTS = [
-        0x0041,
-        0x0042,
-        0x0043,
-        0x0044,
-        0x0045,
-        0x0046,
-        0x0047,
-        0x0048,
-        0x0049,
-        0x004a,
-        0x004b,
-        0x004c,
-        0x004d,
-        0x004e,
-        0x004f,
-        0x0050,
-        0x0051,
-        0x0052,
-        0x0053,
-        0x0054,
-        0x0055,
-        0x0056,
-        0x0057,
-        0x0058,
-        0x0059,
-        0x005a,
-        0x0061,
-        0x0062,
-        0x0063,
-        0x0064,
-        0x0065,
-        0x0066,
-        0x0067,
-        0x0068,
-        0x0069,
-        0x006a,
-        0x006b,
-        0x006c,
-        0x006d,
-        0x006e,
-        0x006f,
-        0x0070,
-        0x0071,
-        0x0072,
-        0x0073,
-        0x0074,
-        0x0075,
-        0x0076,
-        0x0077,
-        0x0078,
-        0x0079,
-        0x007a,
-    ];
-
-    /**
-     * Checks whether the code point is a forward slash ("/") or an uppercase
-     * or lowercase alphabet character
-     */
-    public function matchesWithSlash(int $codepoint): bool
-    {
-        return $codepoint === 0x002f /* '/' */
-            || $this->matches($codepoint);
-    }
-
-    /**
-     * @inheritdoc
+     * Returns true if the code point is a Latin uppercase letter A-Z or
+     * lowercase letter a-z
      */
-    protected function getCodePoints(): array
+    public function matches(int $codepoint): bool
     {
-        return self::CODE_POINTS;
+        return ($codepoint >= 0x0041 && $codepoint <= 0x005a)
+            || ($codepoint >= 0x0061 && $codepoint <= 0x007a);
     }
 }
diff --git a/src/Icu/MessageFormat/Parser/Util/IsPatternSyntax.php b/src/Icu/MessageFormat/Parser/Util/IsPatternSyntax.php
index ce3655c..e6903aa 100644
--- a/src/Icu/MessageFormat/Parser/Util/IsPatternSyntax.php
+++ b/src/Icu/MessageFormat/Parser/Util/IsPatternSyntax.php
@@ -23,2787 +23,53 @@
 namespace FormatPHP\Icu\MessageFormat\Parser\Util;
 
 /**
+ * Checks whether a code point is in the Unicode Character Database
+ * Pattern_Syntax group
+ *
  * @internal
  */
-class IsPatternSyntax extends AbstractCodePointMatcher
+class IsPatternSyntax implements CodePointMatcherInterface
 {
     /**
-     * Pattern syntax code points
+     * Returns true if the code point is in the Pattern_Syntax group in the
+     * Unicode Character Database (UCD)
      *
-     * This list is derived from the Pattern_Syntax code points listed in the
-     * Unicode Character Database PropList. We converted it to an array for
-     * better performance.
+     * This function matches exactly 2760 code points. The values are derived
+     * from PropList-14.0.0.txt, dated 2021-08-12, 23:13:05 GMT. Ranges have
+     * been collapsed for optimal performance.
      *
-     * @link https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt UCD PropList
-     */
-    protected const CODE_POINTS = [
-        0x0021,
-        0x0022,
-        0x0023,
-        0x0024,
-        0x0025,
-        0x0026,
-        0x0027,
-        0x0028,
-        0x0029,
-        0x002a,
-        0x002b,
-        0x002c,
-        0x002d,
-        0x002e,
-        0x002f,
-        0x003a,
-        0x003b,
-        0x003c,
-        0x003d,
-        0x003e,
-        0x003f,
-        0x0040,
-        0x005b,
-        0x005c,
-        0x005d,
-        0x005e,
-        0x0060,
-        0x007b,
-        0x007c,
-        0x007d,
-        0x007e,
-        0x00a1,
-        0x00a2,
-        0x00a3,
-        0x00a4,
-        0x00a5,
-        0x00a6,
-        0x00a7,
-        0x00a9,
-        0x00ab,
-        0x00ac,
-        0x00ae,
-        0x00b0,
-        0x00b1,
-        0x00b6,
-        0x00bb,
-        0x00bf,
-        0x00d7,
-        0x00f7,
-        0x2010,
-        0x2011,
-        0x2012,
-        0x2013,
-        0x2014,
-        0x2015,
-        0x2016,
-        0x2017,
-        0x2018,
-        0x2019,
-        0x201a,
-        0x201b,
-        0x201c,
-        0x201d,
-        0x201e,
-        0x201f,
-        0x2020,
-        0x2021,
-        0x2022,
-        0x2023,
-        0x2024,
-        0x2025,
-        0x2026,
-        0x2027,
-        0x2030,
-        0x2031,
-        0x2032,
-        0x2033,
-        0x2034,
-        0x2035,
-        0x2036,
-        0x2037,
-        0x2038,
-        0x2039,
-        0x203a,
-        0x203b,
-        0x203c,
-        0x203d,
-        0x203e,
-        0x2041,
-        0x2042,
-        0x2043,
-        0x2044,
-        0x2045,
-        0x2046,
-        0x2047,
-        0x2048,
-        0x2049,
-        0x204a,
-        0x204b,
-        0x204c,
-        0x204d,
-        0x204e,
-        0x204f,
-        0x2050,
-        0x2051,
-        0x2052,
-        0x2053,
-        0x2055,
-        0x2056,
-        0x2057,
-        0x2058,
-        0x2059,
-        0x205a,
-        0x205b,
-        0x205c,
-        0x205d,
-        0x205e,
-        0x2190,
-        0x2191,
-        0x2192,
-        0x2193,
-        0x2194,
-        0x2195,
-        0x2196,
-        0x2197,
-        0x2198,
-        0x2199,
-        0x219a,
-        0x219b,
-        0x219c,
-        0x219d,
-        0x219e,
-        0x219f,
-        0x21a0,
-        0x21a1,
-        0x21a2,
-        0x21a3,
-        0x21a4,
-        0x21a5,
-        0x21a6,
-        0x21a7,
-        0x21a8,
-        0x21a9,
-        0x21aa,
-        0x21ab,
-        0x21ac,
-        0x21ad,
-        0x21ae,
-        0x21af,
-        0x21b0,
-        0x21b1,
-        0x21b2,
-        0x21b3,
-        0x21b4,
-        0x21b5,
-        0x21b6,
-        0x21b7,
-        0x21b8,
-        0x21b9,
-        0x21ba,
-        0x21bb,
-        0x21bc,
-        0x21bd,
-        0x21be,
-        0x21bf,
-        0x21c0,
-        0x21c1,
-        0x21c2,
-        0x21c3,
-        0x21c4,
-        0x21c5,
-        0x21c6,
-        0x21c7,
-        0x21c8,
-        0x21c9,
-        0x21ca,
-        0x21cb,
-        0x21cc,
-        0x21cd,
-        0x21ce,
-        0x21cf,
-        0x21d0,
-        0x21d1,
-        0x21d2,
-        0x21d3,
-        0x21d4,
-        0x21d5,
-        0x21d6,
-        0x21d7,
-        0x21d8,
-        0x21d9,
-        0x21da,
-        0x21db,
-        0x21dc,
-        0x21dd,
-        0x21de,
-        0x21df,
-        0x21e0,
-        0x21e1,
-        0x21e2,
-        0x21e3,
-        0x21e4,
-        0x21e5,
-        0x21e6,
-        0x21e7,
-        0x21e8,
-        0x21e9,
-        0x21ea,
-        0x21eb,
-        0x21ec,
-        0x21ed,
-        0x21ee,
-        0x21ef,
-        0x21f0,
-        0x21f1,
-        0x21f2,
-        0x21f3,
-        0x21f4,
-        0x21f5,
-        0x21f6,
-        0x21f7,
-        0x21f8,
-        0x21f9,
-        0x21fa,
-        0x21fb,
-        0x21fc,
-        0x21fd,
-        0x21fe,
-        0x21ff,
-        0x2200,
-        0x2201,
-        0x2202,
-        0x2203,
-        0x2204,
-        0x2205,
-        0x2206,
-        0x2207,
-        0x2208,
-        0x2209,
-        0x220a,
-        0x220b,
-        0x220c,
-        0x220d,
-        0x220e,
-        0x220f,
-        0x2210,
-        0x2211,
-        0x2212,
-        0x2213,
-        0x2214,
-        0x2215,
-        0x2216,
-        0x2217,
-        0x2218,
-        0x2219,
-        0x221a,
-        0x221b,
-        0x221c,
-        0x221d,
-        0x221e,
-        0x221f,
-        0x2220,
-        0x2221,
-        0x2222,
-        0x2223,
-        0x2224,
-        0x2225,
-        0x2226,
-        0x2227,
-        0x2228,
-        0x2229,
-        0x222a,
-        0x222b,
-        0x222c,
-        0x222d,
-        0x222e,
-        0x222f,
-        0x2230,
-        0x2231,
-        0x2232,
-        0x2233,
-        0x2234,
-        0x2235,
-        0x2236,
-        0x2237,
-        0x2238,
-        0x2239,
-        0x223a,
-        0x223b,
-        0x223c,
-        0x223d,
-        0x223e,
-        0x223f,
-        0x2240,
-        0x2241,
-        0x2242,
-        0x2243,
-        0x2244,
-        0x2245,
-        0x2246,
-        0x2247,
-        0x2248,
-        0x2249,
-        0x224a,
-        0x224b,
-        0x224c,
-        0x224d,
-        0x224e,
-        0x224f,
-        0x2250,
-        0x2251,
-        0x2252,
-        0x2253,
-        0x2254,
-        0x2255,
-        0x2256,
-        0x2257,
-        0x2258,
-        0x2259,
-        0x225a,
-        0x225b,
-        0x225c,
-        0x225d,
-        0x225e,
-        0x225f,
-        0x2260,
-        0x2261,
-        0x2262,
-        0x2263,
-        0x2264,
-        0x2265,
-        0x2266,
-        0x2267,
-        0x2268,
-        0x2269,
-        0x226a,
-        0x226b,
-        0x226c,
-        0x226d,
-        0x226e,
-        0x226f,
-        0x2270,
-        0x2271,
-        0x2272,
-        0x2273,
-        0x2274,
-        0x2275,
-        0x2276,
-        0x2277,
-        0x2278,
-        0x2279,
-        0x227a,
-        0x227b,
-        0x227c,
-        0x227d,
-        0x227e,
-        0x227f,
-        0x2280,
-        0x2281,
-        0x2282,
-        0x2283,
-        0x2284,
-        0x2285,
-        0x2286,
-        0x2287,
-        0x2288,
-        0x2289,
-        0x228a,
-        0x228b,
-        0x228c,
-        0x228d,
-        0x228e,
-        0x228f,
-        0x2290,
-        0x2291,
-        0x2292,
-        0x2293,
-        0x2294,
-        0x2295,
-        0x2296,
-        0x2297,
-        0x2298,
-        0x2299,
-        0x229a,
-        0x229b,
-        0x229c,
-        0x229d,
-        0x229e,
-        0x229f,
-        0x22a0,
-        0x22a1,
-        0x22a2,
-        0x22a3,
-        0x22a4,
-        0x22a5,
-        0x22a6,
-        0x22a7,
-        0x22a8,
-        0x22a9,
-        0x22aa,
-        0x22ab,
-        0x22ac,
-        0x22ad,
-        0x22ae,
-        0x22af,
-        0x22b0,
-        0x22b1,
-        0x22b2,
-        0x22b3,
-        0x22b4,
-        0x22b5,
-        0x22b6,
-        0x22b7,
-        0x22b8,
-        0x22b9,
-        0x22ba,
-        0x22bb,
-        0x22bc,
-        0x22bd,
-        0x22be,
-        0x22bf,
-        0x22c0,
-        0x22c1,
-        0x22c2,
-        0x22c3,
-        0x22c4,
-        0x22c5,
-        0x22c6,
-        0x22c7,
-        0x22c8,
-        0x22c9,
-        0x22ca,
-        0x22cb,
-        0x22cc,
-        0x22cd,
-        0x22ce,
-        0x22cf,
-        0x22d0,
-        0x22d1,
-        0x22d2,
-        0x22d3,
-        0x22d4,
-        0x22d5,
-        0x22d6,
-        0x22d7,
-        0x22d8,
-        0x22d9,
-        0x22da,
-        0x22db,
-        0x22dc,
-        0x22dd,
-        0x22de,
-        0x22df,
-        0x22e0,
-        0x22e1,
-        0x22e2,
-        0x22e3,
-        0x22e4,
-        0x22e5,
-        0x22e6,
-        0x22e7,
-        0x22e8,
-        0x22e9,
-        0x22ea,
-        0x22eb,
-        0x22ec,
-        0x22ed,
-        0x22ee,
-        0x22ef,
-        0x22f0,
-        0x22f1,
-        0x22f2,
-        0x22f3,
-        0x22f4,
-        0x22f5,
-        0x22f6,
-        0x22f7,
-        0x22f8,
-        0x22f9,
-        0x22fa,
-        0x22fb,
-        0x22fc,
-        0x22fd,
-        0x22fe,
-        0x22ff,
-        0x2300,
-        0x2301,
-        0x2302,
-        0x2303,
-        0x2304,
-        0x2305,
-        0x2306,
-        0x2307,
-        0x2308,
-        0x2309,
-        0x230a,
-        0x230b,
-        0x230c,
-        0x230d,
-        0x230e,
-        0x230f,
-        0x2310,
-        0x2311,
-        0x2312,
-        0x2313,
-        0x2314,
-        0x2315,
-        0x2316,
-        0x2317,
-        0x2318,
-        0x2319,
-        0x231a,
-        0x231b,
-        0x231c,
-        0x231d,
-        0x231e,
-        0x231f,
-        0x2320,
-        0x2321,
-        0x2322,
-        0x2323,
-        0x2324,
-        0x2325,
-        0x2326,
-        0x2327,
-        0x2328,
-        0x2329,
-        0x232a,
-        0x232b,
-        0x232c,
-        0x232d,
-        0x232e,
-        0x232f,
-        0x2330,
-        0x2331,
-        0x2332,
-        0x2333,
-        0x2334,
-        0x2335,
-        0x2336,
-        0x2337,
-        0x2338,
-        0x2339,
-        0x233a,
-        0x233b,
-        0x233c,
-        0x233d,
-        0x233e,
-        0x233f,
-        0x2340,
-        0x2341,
-        0x2342,
-        0x2343,
-        0x2344,
-        0x2345,
-        0x2346,
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-        0x2ad9,
-        0x2ada,
-        0x2adb,
-        0x2adc,
-        0x2add,
-        0x2ade,
-        0x2adf,
-        0x2ae0,
-        0x2ae1,
-        0x2ae2,
-        0x2ae3,
-        0x2ae4,
-        0x2ae5,
-        0x2ae6,
-        0x2ae7,
-        0x2ae8,
-        0x2ae9,
-        0x2aea,
-        0x2aeb,
-        0x2aec,
-        0x2aed,
-        0x2aee,
-        0x2aef,
-        0x2af0,
-        0x2af1,
-        0x2af2,
-        0x2af3,
-        0x2af4,
-        0x2af5,
-        0x2af6,
-        0x2af7,
-        0x2af8,
-        0x2af9,
-        0x2afa,
-        0x2afb,
-        0x2afc,
-        0x2afd,
-        0x2afe,
-        0x2aff,
-        0x2b00,
-        0x2b01,
-        0x2b02,
-        0x2b03,
-        0x2b04,
-        0x2b05,
-        0x2b06,
-        0x2b07,
-        0x2b08,
-        0x2b09,
-        0x2b0a,
-        0x2b0b,
-        0x2b0c,
-        0x2b0d,
-        0x2b0e,
-        0x2b0f,
-        0x2b10,
-        0x2b11,
-        0x2b12,
-        0x2b13,
-        0x2b14,
-        0x2b15,
-        0x2b16,
-        0x2b17,
-        0x2b18,
-        0x2b19,
-        0x2b1a,
-        0x2b1b,
-        0x2b1c,
-        0x2b1d,
-        0x2b1e,
-        0x2b1f,
-        0x2b20,
-        0x2b21,
-        0x2b22,
-        0x2b23,
-        0x2b24,
-        0x2b25,
-        0x2b26,
-        0x2b27,
-        0x2b28,
-        0x2b29,
-        0x2b2a,
-        0x2b2b,
-        0x2b2c,
-        0x2b2d,
-        0x2b2e,
-        0x2b2f,
-        0x2b30,
-        0x2b31,
-        0x2b32,
-        0x2b33,
-        0x2b34,
-        0x2b35,
-        0x2b36,
-        0x2b37,
-        0x2b38,
-        0x2b39,
-        0x2b3a,
-        0x2b3b,
-        0x2b3c,
-        0x2b3d,
-        0x2b3e,
-        0x2b3f,
-        0x2b40,
-        0x2b41,
-        0x2b42,
-        0x2b43,
-        0x2b44,
-        0x2b45,
-        0x2b46,
-        0x2b47,
-        0x2b48,
-        0x2b49,
-        0x2b4a,
-        0x2b4b,
-        0x2b4c,
-        0x2b4d,
-        0x2b4e,
-        0x2b4f,
-        0x2b50,
-        0x2b51,
-        0x2b52,
-        0x2b53,
-        0x2b54,
-        0x2b55,
-        0x2b56,
-        0x2b57,
-        0x2b58,
-        0x2b59,
-        0x2b5a,
-        0x2b5b,
-        0x2b5c,
-        0x2b5d,
-        0x2b5e,
-        0x2b5f,
-        0x2b60,
-        0x2b61,
-        0x2b62,
-        0x2b63,
-        0x2b64,
-        0x2b65,
-        0x2b66,
-        0x2b67,
-        0x2b68,
-        0x2b69,
-        0x2b6a,
-        0x2b6b,
-        0x2b6c,
-        0x2b6d,
-        0x2b6e,
-        0x2b6f,
-        0x2b70,
-        0x2b71,
-        0x2b72,
-        0x2b73,
-        0x2b74,
-        0x2b75,
-        0x2b76,
-        0x2b77,
-        0x2b78,
-        0x2b79,
-        0x2b7a,
-        0x2b7b,
-        0x2b7c,
-        0x2b7d,
-        0x2b7e,
-        0x2b7f,
-        0x2b80,
-        0x2b81,
-        0x2b82,
-        0x2b83,
-        0x2b84,
-        0x2b85,
-        0x2b86,
-        0x2b87,
-        0x2b88,
-        0x2b89,
-        0x2b8a,
-        0x2b8b,
-        0x2b8c,
-        0x2b8d,
-        0x2b8e,
-        0x2b8f,
-        0x2b90,
-        0x2b91,
-        0x2b92,
-        0x2b93,
-        0x2b94,
-        0x2b95,
-        0x2b96,
-        0x2b97,
-        0x2b98,
-        0x2b99,
-        0x2b9a,
-        0x2b9b,
-        0x2b9c,
-        0x2b9d,
-        0x2b9e,
-        0x2b9f,
-        0x2ba0,
-        0x2ba1,
-        0x2ba2,
-        0x2ba3,
-        0x2ba4,
-        0x2ba5,
-        0x2ba6,
-        0x2ba7,
-        0x2ba8,
-        0x2ba9,
-        0x2baa,
-        0x2bab,
-        0x2bac,
-        0x2bad,
-        0x2bae,
-        0x2baf,
-        0x2bb0,
-        0x2bb1,
-        0x2bb2,
-        0x2bb3,
-        0x2bb4,
-        0x2bb5,
-        0x2bb6,
-        0x2bb7,
-        0x2bb8,
-        0x2bb9,
-        0x2bba,
-        0x2bbb,
-        0x2bbc,
-        0x2bbd,
-        0x2bbe,
-        0x2bbf,
-        0x2bc0,
-        0x2bc1,
-        0x2bc2,
-        0x2bc3,
-        0x2bc4,
-        0x2bc5,
-        0x2bc6,
-        0x2bc7,
-        0x2bc8,
-        0x2bc9,
-        0x2bca,
-        0x2bcb,
-        0x2bcc,
-        0x2bcd,
-        0x2bce,
-        0x2bcf,
-        0x2bd0,
-        0x2bd1,
-        0x2bd2,
-        0x2bd3,
-        0x2bd4,
-        0x2bd5,
-        0x2bd6,
-        0x2bd7,
-        0x2bd8,
-        0x2bd9,
-        0x2bda,
-        0x2bdb,
-        0x2bdc,
-        0x2bdd,
-        0x2bde,
-        0x2bdf,
-        0x2be0,
-        0x2be1,
-        0x2be2,
-        0x2be3,
-        0x2be4,
-        0x2be5,
-        0x2be6,
-        0x2be7,
-        0x2be8,
-        0x2be9,
-        0x2bea,
-        0x2beb,
-        0x2bec,
-        0x2bed,
-        0x2bee,
-        0x2bef,
-        0x2bf0,
-        0x2bf1,
-        0x2bf2,
-        0x2bf3,
-        0x2bf4,
-        0x2bf5,
-        0x2bf6,
-        0x2bf7,
-        0x2bf8,
-        0x2bf9,
-        0x2bfa,
-        0x2bfb,
-        0x2bfc,
-        0x2bfd,
-        0x2bfe,
-        0x2bff,
-        0x2e00,
-        0x2e01,
-        0x2e02,
-        0x2e03,
-        0x2e04,
-        0x2e05,
-        0x2e06,
-        0x2e07,
-        0x2e08,
-        0x2e09,
-        0x2e0a,
-        0x2e0b,
-        0x2e0c,
-        0x2e0d,
-        0x2e0e,
-        0x2e0f,
-        0x2e10,
-        0x2e11,
-        0x2e12,
-        0x2e13,
-        0x2e14,
-        0x2e15,
-        0x2e16,
-        0x2e17,
-        0x2e18,
-        0x2e19,
-        0x2e1a,
-        0x2e1b,
-        0x2e1c,
-        0x2e1d,
-        0x2e1e,
-        0x2e1f,
-        0x2e20,
-        0x2e21,
-        0x2e22,
-        0x2e23,
-        0x2e24,
-        0x2e25,
-        0x2e26,
-        0x2e27,
-        0x2e28,
-        0x2e29,
-        0x2e2a,
-        0x2e2b,
-        0x2e2c,
-        0x2e2d,
-        0x2e2e,
-        0x2e2f,
-        0x2e30,
-        0x2e31,
-        0x2e32,
-        0x2e33,
-        0x2e34,
-        0x2e35,
-        0x2e36,
-        0x2e37,
-        0x2e38,
-        0x2e39,
-        0x2e3a,
-        0x2e3b,
-        0x2e3c,
-        0x2e3d,
-        0x2e3e,
-        0x2e3f,
-        0x2e40,
-        0x2e41,
-        0x2e42,
-        0x2e43,
-        0x2e44,
-        0x2e45,
-        0x2e46,
-        0x2e47,
-        0x2e48,
-        0x2e49,
-        0x2e4a,
-        0x2e4b,
-        0x2e4c,
-        0x2e4d,
-        0x2e4e,
-        0x2e4f,
-        0x2e50,
-        0x2e51,
-        0x2e52,
-        0x2e53,
-        0x2e54,
-        0x2e55,
-        0x2e56,
-        0x2e57,
-        0x2e58,
-        0x2e59,
-        0x2e5a,
-        0x2e5b,
-        0x2e5c,
-        0x2e5d,
-        0x2e5e,
-        0x2e5f,
-        0x2e60,
-        0x2e61,
-        0x2e62,
-        0x2e63,
-        0x2e64,
-        0x2e65,
-        0x2e66,
-        0x2e67,
-        0x2e68,
-        0x2e69,
-        0x2e6a,
-        0x2e6b,
-        0x2e6c,
-        0x2e6d,
-        0x2e6e,
-        0x2e6f,
-        0x2e70,
-        0x2e71,
-        0x2e72,
-        0x2e73,
-        0x2e74,
-        0x2e75,
-        0x2e76,
-        0x2e77,
-        0x2e78,
-        0x2e79,
-        0x2e7a,
-        0x2e7b,
-        0x2e7c,
-        0x2e7d,
-        0x2e7e,
-        0x2e7f,
-        0x3001,
-        0x3002,
-        0x3003,
-        0x3008,
-        0x3009,
-        0x300a,
-        0x300b,
-        0x300c,
-        0x300d,
-        0x300e,
-        0x300f,
-        0x3010,
-        0x3011,
-        0x3012,
-        0x3013,
-        0x3014,
-        0x3015,
-        0x3016,
-        0x3017,
-        0x3018,
-        0x3019,
-        0x301a,
-        0x301b,
-        0x301c,
-        0x301d,
-        0x301e,
-        0x301f,
-        0x3020,
-        0x3030,
-        0xfd3e,
-        0xfd3f,
-        0xfe45,
-        0xfe46,
-    ];
-
-    /**
-     * @inheritdoc
+     * @link https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt UCD PropList, Latest
+     * @link https://www.unicode.org/Public/14.0.0/ucd/PropList.txt UCD PropList, 14.0.0
      */
-    protected function getCodePoints(): array
+    public function matches(int $codepoint): bool
     {
-        return self::CODE_POINTS;
+        return ($codepoint >= 0x0021 && $codepoint <= 0x002f)
+            || ($codepoint >= 0x003a && $codepoint <= 0x0040)
+            || ($codepoint >= 0x005b && $codepoint <= 0x005e)
+            || $codepoint === 0x0060
+            || ($codepoint >= 0x007b && $codepoint <= 0x007e)
+            || ($codepoint >= 0x00a1 && $codepoint <= 0x00a7)
+            || $codepoint === 0x00a9
+            || ($codepoint >= 0x00ab && $codepoint <= 0x00ac)
+            || $codepoint === 0x00ae
+            || ($codepoint >= 0x00b0 && $codepoint <= 0x00b1)
+            || $codepoint === 0x00b6
+            || $codepoint === 0x00bb
+            || $codepoint === 0x00bf
+            || $codepoint === 0x00d7
+            || $codepoint === 0x00f7
+            || ($codepoint >= 0x2010 && $codepoint <= 0x2027)
+            || ($codepoint >= 0x2030 && $codepoint <= 0x203e)
+            || ($codepoint >= 0x2041 && $codepoint <= 0x2053)
+            || ($codepoint >= 0x2055 && $codepoint <= 0x205e)
+            || ($codepoint >= 0x2190 && $codepoint <= 0x245f)
+            || ($codepoint >= 0x2500 && $codepoint <= 0x2775)
+            || ($codepoint >= 0x2794 && $codepoint <= 0x2bff)
+            || ($codepoint >= 0x2e00 && $codepoint <= 0x2e7f)
+            || ($codepoint >= 0x3001 && $codepoint <= 0x3003)
+            || ($codepoint >= 0x3008 && $codepoint <= 0x3020)
+            || $codepoint === 0x3030
+            || ($codepoint >= 0xfd3e && $codepoint <= 0xfd3f)
+            || ($codepoint >= 0xfe45 && $codepoint <= 0xfe46);
     }
 }
diff --git a/src/Icu/MessageFormat/Parser/Util/IsPotentialElementNameChar.php b/src/Icu/MessageFormat/Parser/Util/IsPotentialElementNameChar.php
index 17f91e1..a7e7960 100644
--- a/src/Icu/MessageFormat/Parser/Util/IsPotentialElementNameChar.php
+++ b/src/Icu/MessageFormat/Parser/Util/IsPotentialElementNameChar.php
@@ -23,30 +23,47 @@
 namespace FormatPHP\Icu\MessageFormat\Parser\Util;
 
 /**
+ * Checks whether the code point could be used in an HTML tag element name
+ *
  * @internal
  */
 class IsPotentialElementNameChar implements CodePointMatcherInterface
 {
     /**
-     * Checks whether the code point could be used in an element name
+     * Returns true if the code point could be used in an HTML tag element name
+     *
+     * This function matches exactly 971,632 code points.
+     *
+     * A tag name must start with an ASCII lower/upper case letter. The grammar
+     * is based on the HTML custom element name except that a dash is NOT always
+     * mandatory and uppercase letters are accepted:
+     *
+     * ```
+     * tag ::= "<" tagName (whitespace)* "/>" |
+     *     "<" tagName (whitespace)* ">" message "</" tagName (whitespace)* ">"
+     * tagName ::= [a-z] (PENChar)*
+     * PENChar ::=
+     *     "-" | "." | [0-9] | "_" | [a-z] | [A-Z] | #xB7 | [#xC0-#xD6] |
+     *     [#xD8-#xF6] | [#xF8-#x37D] | [#x37F-#x1FFF] | [#x200C-#x200D] |
+     *     [#x203F-#x2040] | [#x2070-#x218F] | [#x2C00-#x2FEF] |
+     *     [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] |
+     *     [#x10000-#xEFFFF]
+     * ```
      *
-     * We could convert this to an array, like we did for the other code point
-     * matchers, but this list has 54,128 code points in it, so we have opted
-     * to use a logical statement instead.
+     * @link https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name HTML custom element name
      */
     public function matches(int $codepoint): bool
     {
-        return $codepoint === 45 /* '-' */
-            || $codepoint === 46 /* '.' */
-            || ($codepoint >= 48 && $codepoint <= 57) /* 0..9 */
-            || $codepoint === 95 /* '_' */
-            || ($codepoint >= 97 && $codepoint <= 122) /* a..z */
-            || ($codepoint >= 65 && $codepoint <= 90) /* A..Z */
-            || $codepoint === 0xb7
-            || ($codepoint >= 0xc0 && $codepoint <= 0xd6)
-            || ($codepoint >= 0xd8 && $codepoint <= 0xf6)
-            || ($codepoint >= 0xf8 && $codepoint <= 0x37d)
-            || ($codepoint >= 0x37f && $codepoint <= 0x1fff)
+        return ($codepoint >= 0x002d && $codepoint <= 0x002e)
+            || ($codepoint >= 0x0030 && $codepoint <= 0x0039)
+            || ($codepoint >= 0x0041 && $codepoint <= 0x005a)
+            || $codepoint === 0x005f
+            || ($codepoint >= 0x0061 && $codepoint <= 0x007a)
+            || $codepoint === 0x00b7
+            || ($codepoint >= 0x00c0 && $codepoint <= 0x00d6)
+            || ($codepoint >= 0x00d8 && $codepoint <= 0x00f6)
+            || ($codepoint >= 0x00f8 && $codepoint <= 0x037d)
+            || ($codepoint >= 0x037f && $codepoint <= 0x1fff)
             || ($codepoint >= 0x200c && $codepoint <= 0x200d)
             || ($codepoint >= 0x203f && $codepoint <= 0x2040)
             || ($codepoint >= 0x2070 && $codepoint <= 0x218f)
diff --git a/src/Icu/MessageFormat/Parser/Util/IsWhiteSpace.php b/src/Icu/MessageFormat/Parser/Util/IsWhiteSpace.php
index d30a047..69a5238 100644
--- a/src/Icu/MessageFormat/Parser/Util/IsWhiteSpace.php
+++ b/src/Icu/MessageFormat/Parser/Util/IsWhiteSpace.php
@@ -23,38 +23,52 @@
 namespace FormatPHP\Icu\MessageFormat\Parser\Util;
 
 /**
+ * Checks whether a code point is in the Unicode Character Database
+ * White_Space and Pattern_White_Space groups
+ *
  * @internal
  */
-class IsWhiteSpace extends AbstractCodePointMatcher
+class IsWhiteSpace implements CodePointMatcherInterface
 {
     /**
-     * White space code points
+     * Returns true if the code point is in either the White_Space or
+     * Pattern_White_Space group in the Unicode Character Database (UCD)
      *
-     * This list is derived from the White_Space code points listed in the
-     * Unicode Character Database PropList. We converted it to an array for
-     * better performance.
+     * FormatJS claims its `_isWhiteSpace()` function is the code point
+     * equivalent of `\p{White_Space}`, but this is incorrect. In reality,
+     * their function, as implemented in JavaScript, is the code point
+     * equivalent of `\p{Pattern_White_Space}`, which is a subset of
+     * `\p{White_Space}`, along with `0x200e` (left-to-right bidi mark) and
+     * `0x200f` (right-to-left bidi mark) added.
      *
-     * @link https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt UCD PropList
-     */
-    protected const CODE_POINTS = [
-        0x0009,
-        0x000a,
-        0x000b,
-        0x000c,
-        0x000d,
-        0x0020,
-        0x0085,
-        0x200e,
-        0x200f,
-        0x2028,
-        0x2029,
-    ];
-
-    /**
-     * @inheritdoc
+     * FormatJS uses this function in the case the user's browser doesn't
+     * support the native `\p{White_Space}` regular expression pattern. If the
+     * browser does support it, then it uses `\p{White_Space}` instead.
+     *
+     * In our implementation, we've combined both `White_Space` and
+     * `Pattern_White_Space` code points to accommodate both sets, for maximum
+     * interoperability.
+     *
+     * This function matches exactly 27 code points. The values are derived
+     * from PropList-14.0.0.txt, dated 2021-08-12, 23:13:05 GMT. Ranges have
+     * been collapsed for optimal performance.
+     *
+     * @link https://github.com/formatjs/formatjs/blob/9c50fd13c5a4966adc7e9c22ed21553b7fef5337/packages/icu-messageformat-parser/parser.ts#L1334-L1347 FormatJS _isWhiteSpace()
+     * @link https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt UCD PropList, Latest
+     * @link https://www.unicode.org/Public/14.0.0/ucd/PropList.txt UCD PropList, 14.0.0
      */
-    protected function getCodePoints(): array
+    public function matches(int $codepoint): bool
     {
-        return self::CODE_POINTS;
+        return ($codepoint >= 0x0009 && $codepoint <= 0x000d)
+            || $codepoint === 0x0020
+            || $codepoint === 0x0085
+            || $codepoint === 0x00a0
+            || $codepoint === 0x1680
+            || ($codepoint >= 0x2000 && $codepoint <= 0x200a)
+            || ($codepoint >= 0x200e && $codepoint <= 0x200f)
+            || ($codepoint >= 0x2028 && $codepoint <= 0x2029)
+            || $codepoint === 0x202f
+            || $codepoint === 0x205f
+            || $codepoint === 0x3000;
     }
 }
diff --git a/tests/Icu/MessageFormat/Parser/Util/CodePointHelperTest.php b/tests/Icu/MessageFormat/Parser/Util/CodePointHelperTest.php
new file mode 100644
index 0000000..15fc9f5
--- /dev/null
+++ b/tests/Icu/MessageFormat/Parser/Util/CodePointHelperTest.php
@@ -0,0 +1,227 @@
+<?php
+
+declare(strict_types=1);
+
+namespace FormatPHP\Test\Icu\MessageFormat\Parser\Util;
+
+use FormatPHP\Icu\MessageFormat\Parser\Exception\InvalidUtf8CodePointException;
+use FormatPHP\Icu\MessageFormat\Parser\Util\CodePointHelper;
+use FormatPHP\Test\TestCase;
+
+use function mb_ord;
+use function range;
+
+use const PHP_INT_MAX;
+use const PHP_INT_MIN;
+
+class CodePointHelperTest extends TestCase
+{
+    private CodePointHelper $codePointHelper;
+
+    protected function setUp(): void
+    {
+        $this->codePointHelper = new CodePointHelper();
+    }
+
+    /**
+     * @dataProvider isAlphaProvider
+     */
+    public function testIsAlpha(int $value, bool $expected): void
+    {
+        $this->assertSame($expected, $this->codePointHelper->isAlpha($value));
+    }
+
+    /**
+     * @return non-empty-list<array{int, bool}>
+     */
+    public function isAlphaProvider(): array
+    {
+        $values = [];
+
+        foreach (range('a', 'z') as $char) {
+            $values[] = [mb_ord($char, 'UTF-8'), true];
+        }
+
+        foreach (range('A', 'Z') as $char) {
+            $values[] = [mb_ord($char, 'UTF-8'), true];
+        }
+
+        foreach (range(0, 9) as $char) {
+            $values[] = [mb_ord((string) $char, 'UTF-8'), false];
+        }
+
+        foreach (range('-', '!') as $char) {
+            $values[] = [mb_ord($char, 'UTF-8'), false];
+        }
+
+        return $values;
+    }
+
+    /**
+     * @dataProvider isAlphaOrSlashProvider
+     */
+    public function testIsAlphaOrSlash(int $value, bool $expected): void
+    {
+        $this->assertSame($expected, $this->codePointHelper->isAlphaOrSlash($value));
+    }
+
+    /**
+     * @return non-empty-list<array{int, bool}>
+     */
+    public function isAlphaOrSlashProvider(): array
+    {
+        return [
+            [mb_ord('a', 'UTF-8'), true],
+            [mb_ord('z', 'UTF-8'), true],
+            [mb_ord('A', 'UTF-8'), true],
+            [mb_ord('Z', 'UTF-8'), true],
+            [mb_ord('/', 'UTF-8'), true],
+            [mb_ord('\\', 'UTF-8'), false],
+            [mb_ord('0', 'UTF-8'), false],
+            [mb_ord('!', 'UTF-8'), false],
+            [mb_ord('-', 'UTF-8'), false],
+        ];
+    }
+
+    /**
+     * @dataProvider isWhiteSpaceProvider
+     */
+    public function testIsWhiteSpace(int $value, bool $expected): void
+    {
+        $this->assertSame($expected, $this->codePointHelper->isWhiteSpace($value));
+    }
+
+    /**
+     * @return non-empty-list<array{int, bool}>
+     */
+    public function isWhiteSpaceProvider(): array
+    {
+        return [
+            [0x0009, true],
+            [0x000a, true],
+            [0x000b, true],
+            [0x000c, true],
+            [0x000d, true],
+            [0x0020, true],
+            [0x0085, true],
+            [0x00A0, true],
+            [0x1680, true],
+            [0x2000, true],
+            [0x2001, true],
+            [0x2002, true],
+            [0x2003, true],
+            [0x2004, true],
+            [0x2005, true],
+            [0x2006, true],
+            [0x2007, true],
+            [0x2008, true],
+            [0x2009, true],
+            [0x200a, true],
+            [0x200e, true],
+            [0x200f, true],
+            [0x2028, true],
+            [0x2029, true],
+            [0x202F, true],
+            [0x205F, true],
+            [0x3000, true],
+            [mb_ord('A', 'UTF-8'), false],
+            [mb_ord('Z', 'UTF-8'), false],
+            [mb_ord('!', 'UTF-8'), false],
+            [mb_ord('.', 'UTF-8'), false],
+            [mb_ord('_', 'UTF-8'), false],
+        ];
+    }
+
+    /**
+     * @dataProvider isPatternSyntaxProvider
+     */
+    public function testIsPatternSyntax(int $value, bool $expected): void
+    {
+        $this->assertSame($expected, $this->codePointHelper->isPatternSyntax($value));
+    }
+
+    /**
+     * @return non-empty-list<array{int, bool}>
+     */
+    public function isPatternSyntaxProvider(): array
+    {
+        $values = [];
+
+        foreach (range(0x2190, 0x245f) as $char) {
+            $values[] = [$char, true];
+        }
+
+        foreach (range(0x1000, 0x107f) as $char) {
+            $values[] = [$char, false];
+        }
+
+        return $values;
+    }
+
+    /**
+     * @dataProvider isPotentialElementNameCharProvider
+     */
+    public function testIsPotentialElementNameChar(int $value, bool $expected): void
+    {
+        $this->assertSame($expected, $this->codePointHelper->isPotentialElementNameChar($value));
+    }
+
+    /**
+     * @return non-empty-list<array{int, bool}>
+     */
+    public function isPotentialElementNameCharProvider(): array
+    {
+        $values = [];
+
+        foreach (range(0x00f8, 0x037d) as $char) {
+            $values[] = [$char, true];
+        }
+
+        foreach (range(0xe000, 0xe07f) as $char) {
+            $values[] = [$char, false];
+        }
+
+        return $values;
+    }
+
+    public function testCharCodeAt(): void
+    {
+        $this->assertSame(0x0062, $this->codePointHelper->charCodeAt(['a', 'b', 'c'], 1));
+    }
+
+    public function testCharCodeAtReturnsNull(): void
+    {
+        $this->assertNull($this->codePointHelper->charCodeAt(['a', 'b', 'c'], 3));
+    }
+
+    public function testFromCharCode(): void
+    {
+        $this->assertSame('ã', $this->codePointHelper->fromCharCode(0x00e3));
+    }
+
+    public function testFromCharCodeReturnsNull(): void
+    {
+        $this->assertNull($this->codePointHelper->fromCharCode(PHP_INT_MAX));
+    }
+
+    public function testFromCodePointThrowsException(): void
+    {
+        $this->expectException(InvalidUtf8CodePointException::class);
+        $this->expectExceptionMessage('Code ' . PHP_INT_MAX . ' is an invalid UTF-8 code point');
+
+        $this->codePointHelper->fromCodePoint(PHP_INT_MAX, PHP_INT_MIN);
+    }
+
+    public function testFromCodePointReturnsEmptyString(): void
+    {
+        $this->assertSame('', $this->codePointHelper->fromCodePoint());
+    }
+
+    public function testFromCodePoint(): void
+    {
+        $this->assertSame(
+            'foobar',
+            $this->codePointHelper->fromCodePoint(0x0066, 0x006f, 0x006f, 0x0062, 0x0061, 0x0072),
+        );
+    }
+}
diff --git a/tests/Icu/MessageFormat/Parser/Util/IsAlphaTest.php b/tests/Icu/MessageFormat/Parser/Util/IsAlphaTest.php
new file mode 100644
index 0000000..d7c2f51
--- /dev/null
+++ b/tests/Icu/MessageFormat/Parser/Util/IsAlphaTest.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace FormatPHP\Test\Icu\MessageFormat\Parser\Util;
+
+use FormatPHP\Icu\MessageFormat\Parser\Util\IsAlpha;
+use FormatPHP\Test\TestCase;
+
+use function range;
+
+class IsAlphaTest extends TestCase
+{
+    /**
+     * Loop over 65,535 code points and assert that
+     * exactly 52 code points match IsAlpha
+     */
+    public function testMatches(): void
+    {
+        $isAlpha = new IsAlpha();
+
+        $matches = 0;
+        foreach (range(0x0000, 0xffff) as $codepoint) {
+            if ($isAlpha->matches($codepoint)) {
+                $matches++;
+            }
+        }
+
+        $this->assertSame(52, $matches);
+    }
+}
diff --git a/tests/Icu/MessageFormat/Parser/Util/IsPatternSyntaxTest.php b/tests/Icu/MessageFormat/Parser/Util/IsPatternSyntaxTest.php
new file mode 100644
index 0000000..c8f31d1
--- /dev/null
+++ b/tests/Icu/MessageFormat/Parser/Util/IsPatternSyntaxTest.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace FormatPHP\Test\Icu\MessageFormat\Parser\Util;
+
+use FormatPHP\Icu\MessageFormat\Parser\Util\IsPatternSyntax;
+use FormatPHP\Test\TestCase;
+
+use function range;
+
+class IsPatternSyntaxTest extends TestCase
+{
+    /**
+     * Loop over 65,535 code points and assert that
+     * exactly 2760 code points match IsPatternSyntax
+     */
+    public function testMatches(): void
+    {
+        $isPatternSyntax = new IsPatternSyntax();
+
+        $matches = 0;
+        foreach (range(0x0000, 0xffff) as $codepoint) {
+            if ($isPatternSyntax->matches($codepoint)) {
+                $matches++;
+            }
+        }
+
+        $this->assertSame(2760, $matches);
+    }
+}
diff --git a/tests/Icu/MessageFormat/Parser/Util/IsPotentialElementNameCharTest.php b/tests/Icu/MessageFormat/Parser/Util/IsPotentialElementNameCharTest.php
new file mode 100644
index 0000000..0722a35
--- /dev/null
+++ b/tests/Icu/MessageFormat/Parser/Util/IsPotentialElementNameCharTest.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace FormatPHP\Test\Icu\MessageFormat\Parser\Util;
+
+use FormatPHP\Icu\MessageFormat\Parser\Util\IsPotentialElementNameChar;
+use FormatPHP\Test\TestCase;
+
+use function range;
+
+class IsPotentialElementNameCharTest extends TestCase
+{
+    /**
+     * Loop over 1,048,575 code points and assert that
+     * exactly 971,632 code points match IsPotentialElementNameChar
+     */
+    public function testMatches(): void
+    {
+        $isPotentialElementNameChar = new IsPotentialElementNameChar();
+
+        $matches = 0;
+        foreach (range(0x0000, 0xfffff) as $codepoint) {
+            if ($isPotentialElementNameChar->matches($codepoint)) {
+                $matches++;
+            }
+        }
+
+        $this->assertSame(971_632, $matches);
+    }
+}
diff --git a/tests/Icu/MessageFormat/Parser/Util/IsWhiteSpaceTest.php b/tests/Icu/MessageFormat/Parser/Util/IsWhiteSpaceTest.php
new file mode 100644
index 0000000..8b5e890
--- /dev/null
+++ b/tests/Icu/MessageFormat/Parser/Util/IsWhiteSpaceTest.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace FormatPHP\Test\Icu\MessageFormat\Parser\Util;
+
+use FormatPHP\Icu\MessageFormat\Parser\Util\IsWhiteSpace;
+use FormatPHP\Test\TestCase;
+
+use function range;
+
+class IsWhiteSpaceTest extends TestCase
+{
+    /**
+     * Loop over 65,535 code points and assert that
+     * exactly 27 code points match IsWhiteSpace
+     */
+    public function testMatches(): void
+    {
+        $isWhiteSpace = new IsWhiteSpace();
+
+        $matches = 0;
+        foreach (range(0x0000, 0xffff) as $codepoint) {
+            if ($isWhiteSpace->matches($codepoint)) {
+                $matches++;
+            }
+        }
+
+        $this->assertSame(27, $matches);
+    }
+}