From 0dcca6125eb4b7ca2a8a85e82647829735958542 Mon Sep 17 00:00:00 2001
From: Alexander Zaytsev <hazzik@gmail.com>
Date: Fri, 19 Dec 2014 20:26:21 +1300
Subject: [PATCH] Use RegexOptions.Compiled if available

---
 src/Humanizer/Humanizer.csproj            |  1 +
 src/Humanizer/InflectorExtensions.cs      |  2 +-
 src/Humanizer/RegexOptionsUtil.cs         | 21 +++++++++++++++++++++
 src/Humanizer/RomanNumeralExtensions.cs   |  2 +-
 src/Humanizer/StringHumanizeExtensions.cs |  4 ++--
 5 files changed, 26 insertions(+), 4 deletions(-)
 create mode 100644 src/Humanizer/RegexOptionsUtil.cs

diff --git a/src/Humanizer/Humanizer.csproj b/src/Humanizer/Humanizer.csproj
index dadba6555..048cef089 100644
--- a/src/Humanizer/Humanizer.csproj
+++ b/src/Humanizer/Humanizer.csproj
@@ -109,6 +109,7 @@
     <Compile Include="Localisation\Ordinalizers\ItalianOrdinalizer.cs" />
     <Compile Include="Localisation\Tense.cs" />
     <Compile Include="Localisation\NumberToWords\SpanishNumberToWordsConverter.cs" />
+    <Compile Include="RegexOptionsUtil.cs" />
     <Compile Include="TimeSpanHumanizeExtensions.cs" />
     <Compile Include="FluentDate\In.SomeTimeFrom.cs">
       <AutoGen>True</AutoGen>
diff --git a/src/Humanizer/InflectorExtensions.cs b/src/Humanizer/InflectorExtensions.cs
index e0ea8bde6..52155269c 100644
--- a/src/Humanizer/InflectorExtensions.cs
+++ b/src/Humanizer/InflectorExtensions.cs
@@ -127,7 +127,7 @@ private class Rule
 
             public Rule(string pattern, string replacement)
             {
-                _regex = new Regex(pattern, RegexOptions.IgnoreCase);
+                _regex = new Regex(pattern, RegexOptions.IgnoreCase | RegexOptionsUtil.Compiled);
                 _replacement = replacement;
             }
 
diff --git a/src/Humanizer/RegexOptionsUtil.cs b/src/Humanizer/RegexOptionsUtil.cs
new file mode 100644
index 000000000..655a7627e
--- /dev/null
+++ b/src/Humanizer/RegexOptionsUtil.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Text.RegularExpressions;
+
+namespace Humanizer
+{
+    internal static class RegexOptionsUtil
+    {
+        private static readonly RegexOptions _compiled;
+
+        static RegexOptionsUtil()
+        {
+            RegexOptions compiled;
+            _compiled = Enum.TryParse("Compiled", out compiled) ? compiled : RegexOptions.None;
+        }
+
+        public static RegexOptions Compiled
+        {
+            get { return _compiled; }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Humanizer/RomanNumeralExtensions.cs b/src/Humanizer/RomanNumeralExtensions.cs
index d6e72b772..9ae801178 100644
--- a/src/Humanizer/RomanNumeralExtensions.cs
+++ b/src/Humanizer/RomanNumeralExtensions.cs
@@ -34,7 +34,7 @@ public static class RomanNumeralExtensions
         private static readonly Regex ValidRomanNumeral = 
             new Regex(
                 "^(?i:(?=[MDCLXVI])((M{0,3})((C[DM])|(D?C{0,3}))?((X[LC])|(L?XX{0,2})|L)?((I[VX])|(V?(II{0,2}))|V)?))$",
-                RegexOptions.None);
+                RegexOptionsUtil.Compiled);
 
         /// <summary>
         /// Converts Roman numbers into integer
diff --git a/src/Humanizer/StringHumanizeExtensions.cs b/src/Humanizer/StringHumanizeExtensions.cs
index 3a95a8816..d438222f0 100644
--- a/src/Humanizer/StringHumanizeExtensions.cs
+++ b/src/Humanizer/StringHumanizeExtensions.cs
@@ -15,8 +15,8 @@ public static class StringHumanizeExtensions
         static StringHumanizeExtensions()
         {
             PascalCaseWordPartsRegex = new Regex(@"[A-Z]?[a-z]+|[0-9]+|[A-Z]+(?=[A-Z][a-z]|[0-9]|\b)",
-                RegexOptions.IgnorePatternWhitespace | RegexOptions.ExplicitCapture);
-            FreestandingSpacingCharRegex = new Regex(@"\s[-_]|[-_]\s");
+                RegexOptions.IgnorePatternWhitespace | RegexOptions.ExplicitCapture | RegexOptionsUtil.Compiled);
+            FreestandingSpacingCharRegex = new Regex(@"\s[-_]|[-_]\s", RegexOptionsUtil.Compiled);
         }
 
         static string FromUnderscoreDashSeparatedWords (string input)