[Mono-bugs] [Bug 675288] RegEx qualifier {0} differs from Microsoft implementation (and expectation)

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=675288

https://bugzilla.novell.com/show_bug.cgi?id=675288#c1


Damien Degois <damien at degois.info> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |damien at degois.info

--- Comment #1 from Damien Degois <damien at degois.info> 2011-02-26 01:13:46 UTC ---
Proposed patch for review/integration of
mcs/class/System/System.Text.RegularExpressions/parser.cs

--- mcs/class/System/System.Text.RegularExpressions/ORG_parser.cs    2011-02-26
01:53:57.492607003 +0100
+++ mcs/class/System/System.Text.RegularExpressions/parser.cs    2011-02-26
02:00:03.912607003 +0100
@@ -774,7 +774,7 @@
             /* assign min and max */

             min = n;
-            if (m > 0)
+            if (m >= 0)
                 max = m;
             else
                 max = 0x7fffffff;




Regards,
Damien Degois

PS: Follows, new test code:

using System;
using System.Text.RegularExpressions;

namespace testREGEXP
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            Regex r;
            MatchCollection mc;

            Console.WriteLine("Test #1: (expected NO match)");
            r = new Regex("a(?:b|c){0}(d)");
            mc = r.Matches("acd");
            ShowMatchCollection(mc);

            Console.WriteLine("-----------------------------");
            Console.WriteLine("Test #2: (expected 1 match)");
            r = new Regex("a(?:b|c){0}(d)");
            mc = r.Matches("ad");
            ShowMatchCollection(mc);

            Console.WriteLine("-----------------------------");
            Console.WriteLine("Test #3: (expected 1 match)");
            r = new Regex("a(?:b|c){0,}(d)");
            mc = r.Matches("abbcbcd");
            ShowMatchCollection(mc);

            Console.WriteLine("-----------------------------");
            Console.WriteLine("Test #4: (expected NO match)");
            r = new Regex("a(?:b|c){,2}(d)");
            mc = r.Matches("abbcbcd");
            ShowMatchCollection(mc);

            Console.WriteLine ("Ends.");

        }
        public static void ShowMatchCollection(MatchCollection mc) {
            int match_count = 0;
            foreach(Match m in mc) {
                for (int i = 0; i < m.Groups.Count; i++) {
                   
Console.Write(string.Format("{0}:{1}\t",i,m.Groups[i].Value));
                }
                match_count++;
                Console.WriteLine();
            }
            Console.WriteLine("Got {0} match(s)",match_count);
        }
    }
}

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