diff --git a/src/Lib/XmlPatterns.php b/src/Lib/XmlPatterns.php
new file mode 100644
index 0000000..86a4d1b
--- /dev/null
+++ b/src/Lib/XmlPatterns.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace RefactorStudio\PhpArrayToXml\Lib;
+
+class XmlPatterns
+{
+    /**
+     * Get a regex pattern for valid tag names
+     *
+     * @return string
+     */
+    public static function getValidXmlTagNamePattern()
+    {
+        return '~
+            # XML 1.0 Name symbol PHP PCRE regex <http://www.w3.org/TR/REC-xml/#NT-Name>
+            (?(DEFINE)
+                (?<NameStartChar> [:A-Z_a-z\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\x{2FF}\\x{370}-\\x{37D}\\x{37F}-\\x{1FFF}\\x{200C}-\\x{200D}\\x{2070}-\\x{218F}\\x{2C00}-\\x{2FEF}\\x{3001}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFFD}\\x{10000}-\\x{EFFFF}])
+                (?<NameChar>      (?&NameStartChar) | [.\\-0-9\\xB7\\x{0300}-\\x{036F}\\x{203F}-\\x{2040}])
+                (?<Name>          (?&NameStartChar) (?&NameChar)*)
+            )
+            ^(?&Name)$
+            ~ux';
+    }
+
+    /**
+     * Get a regex pattern for valid tag chars
+     *
+     * @return string
+     */
+    public static function getValidXmlTagNameChar()
+    {
+        return '~
+            (?(DEFINE)
+                (?<NameStartChar> [:A-Z_a-z\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\x{2FF}\\x{370}-\\x{37D}\\x{37F}-\\x{1FFF}\\x{200C}-\\x{200D}\\x{2070}-\\x{218F}\\x{2C00}-\\x{2FEF}\\x{3001}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFFD}\\x{10000}-\\x{EFFFF}])
+                (?<NameChar>      (?&NameStartChar) | [.\\-0-9\\xB7\\x{0300}-\\x{036F}\\x{203F}-\\x{2040}])
+            )
+            ^(?&NameChar)$
+            ~ux';
+    }
+
+    /**
+     * Get a regex pattern for valid tag starting characters
+     *
+     * @return string
+     */
+    public static function getValidXmlTagStartPattern()
+    {
+        return '~^([:A-Z_a-z\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\x{2FF}\\x{370}-\\x{37D}\\x{37F}-\\x{1FFF}\\x{200C}-\\x{200D}\\x{2070}-\\x{218F}\\x{2C00}-\\x{2FEF}\\x{3001}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFFD}\\x{10000}-\\x{EFFFF}])~ux';
+    }
+}
\ No newline at end of file
diff --git a/src/PhpArrayToXml.php b/src/PhpArrayToXml.php
index af4a1e7..03c33d1 100644
--- a/src/PhpArrayToXml.php
+++ b/src/PhpArrayToXml.php
@@ -4,6 +4,7 @@
 
 use DOMDocument;
 use DOMElement;
+use RefactorStudio\PhpArrayToXml\Lib\XmlPatterns;
 
 class PhpArrayToXml
 {
@@ -340,7 +341,7 @@ public function getCastNullValue()
      */
     public static function hasValidXmlTagStartingChar($value = null)
     {
-        if (preg_match(self::getValidXmlTagStartPattern(), $value) === 1) {
+        if (preg_match(XmlPatterns::getValidXmlTagStartPattern(), $value) === 1) {
             return true;
         }
         return false;
@@ -354,7 +355,7 @@ public static function hasValidXmlTagStartingChar($value = null)
      */
     public static function isValidXmlTagChar($value = null)
     {
-        if (preg_match(self::getValidXmlTagNameChar(), $value) === 1) {
+        if (preg_match(XmlPatterns::getValidXmlTagNameChar(), $value) === 1) {
             return true;
         }
         return false;
@@ -372,7 +373,7 @@ public static function isValidXmlTag($value = null)
             return false;
         }
 
-        if (preg_match(self::getValidXmlTagNamePattern(), $value) === 1) {
+        if (preg_match(XmlPatterns::getValidXmlTagNamePattern(), $value) === 1) {
             return true;
         }
         return false;
@@ -398,50 +399,6 @@ public function toXmlString($array = [])
         return $this->_doc->saveXML();
     }
 
-    /**
-     * Get a regex pattern for valid tag names
-     *
-     * @return string
-     */
-    protected static function getValidXmlTagNamePattern()
-    {
-        return '~
-            # XML 1.0 Name symbol PHP PCRE regex <http://www.w3.org/TR/REC-xml/#NT-Name>
-            (?(DEFINE)
-                (?<NameStartChar> [:A-Z_a-z\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\x{2FF}\\x{370}-\\x{37D}\\x{37F}-\\x{1FFF}\\x{200C}-\\x{200D}\\x{2070}-\\x{218F}\\x{2C00}-\\x{2FEF}\\x{3001}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFFD}\\x{10000}-\\x{EFFFF}])
-                (?<NameChar>      (?&NameStartChar) | [.\\-0-9\\xB7\\x{0300}-\\x{036F}\\x{203F}-\\x{2040}])
-                (?<Name>          (?&NameStartChar) (?&NameChar)*)
-            )
-            ^(?&Name)$
-            ~ux';
-    }
-
-    /**
-     * Get a regex pattern for valid tag chars
-     *
-     * @return string
-     */
-    protected static function getValidXmlTagNameChar()
-    {
-        return '~
-            (?(DEFINE)
-                (?<NameStartChar> [:A-Z_a-z\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\x{2FF}\\x{370}-\\x{37D}\\x{37F}-\\x{1FFF}\\x{200C}-\\x{200D}\\x{2070}-\\x{218F}\\x{2C00}-\\x{2FEF}\\x{3001}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFFD}\\x{10000}-\\x{EFFFF}])
-                (?<NameChar>      (?&NameStartChar) | [.\\-0-9\\xB7\\x{0300}-\\x{036F}\\x{203F}-\\x{2040}])
-            )
-            ^(?&NameChar)$
-            ~ux';
-    }
-
-    /**
-     * Get a regex pattern for valid tag starting characters
-     *
-     * @return string
-     */
-    protected static function getValidXmlTagStartPattern()
-    {
-        return '~^([:A-Z_a-z\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\x{2FF}\\x{370}-\\x{37D}\\x{37F}-\\x{1FFF}\\x{200C}-\\x{200D}\\x{2070}-\\x{218F}\\x{2C00}-\\x{2FEF}\\x{3001}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFFD}\\x{10000}-\\x{EFFFF}])~ux';
-    }
-
     /**
      * Converts arrays to DOMDocument elements
      *