[Mono-bugs] [Bug 78295][Nor] New - System.Text.RegularExpression.Regex not supporting RegexOptions.RightToLeft

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Changed by russell.kay at realtimeworlds.com.

http://bugzilla.ximian.com/show_bug.cgi?id=78295

--- shadow/78295	2006-05-04 12:49:27.000000000 -0400
+++ shadow/78295.tmp.21767	2006-05-04 12:49:27.000000000 -0400
@@ -0,0 +1,99 @@
+Bug#: 78295
+Product: Mono: Class Libraries
+Version: 1.1
+OS: Mac OS X 10.3
+OS Details: 10.4.6
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: System
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: Russell.Kay at realtimeworlds.com               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: System.Text.RegularExpression.Regex not supporting RegexOptions.RightToLeft
+
+Description of Problem:
+Currently an exception is thrown if RegExOptions.RightToLeft is specified
+on a regular expression.
+
+Steps to reproduce the problem:
+1. compile the program below using gmcs
+2. run it using mono
+3. 
+
+Actual Results:
+The regular expression that uses the option RightToLeft will cause an
+exception on mono.
+
+
+Expected Results:
+Both regular expressions will be executed without any exceptions.
+The test works fine on Windows - even if compiled with gmcs.
+
+How often does this happen? 
+all the time.
+
+Additional Information:
+Cheetah is the fastest land animal.
+
+---- cut from here ----
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace Test
+{
+	class RegExTest
+	{
+	
+		public static string substitute( Match _m )
+		{
+			string ret = null;
+			string innerString = _m.Value.Substring( 2, _m.Length - 3 );
+			switch( innerString )
+			{
+			case "foo":
+				ret = "bar";
+				break;
+			case "hello":
+				ret = "world";
+				break;
+			} // end switch
+			
+			if (ret == null) {
+				ret = "ERROR";
+			} // end if
+			
+			return ret;
+		} // end substitute
+	
+		public static string resolve( string _value, Regex _regex )
+		{
+			string ret = _value;
+			MatchEvaluator eval = new MatchEvaluator( substitute );
+			do {
+				ret = _regex.Replace( ret, eval);
+			} while( _regex.IsMatch(ret) );
+			return ret;
+		} // end resolve
+	
+	
+		static void Main( string[] _args )
+		{
+            Regex regexpLR = new Regex("\\@\\([^\\)]*?\\)" );
+            Regex regexpRL = new Regex("\\@\\([^\\)]*?\\)",
+RegexOptions.RightToLeft);
+            
+            string testString = "@(foo) @(hello)";
+            System.Console.WriteLine( "Regex Left to Right {0} = {1}",
+testString, resolve( testString, regexpLR ) );
+            System.Console.WriteLine( "Regex Right to Left {0} = {1}",
+testString, resolve( testString, regexpRL ) );
+		} // end Main
+	}
+}