Added regexp tests from PCRE.

test/mjsunit/regexp-capture.js

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 32 matching lines @@
         return String($1); 
     }));
 assertEquals("undefined", "y".replace(/(x)?y/, 
     function($0, $1){ 
         return String($1); 
     }));
 assertEquals("undefined", "y".replace(/(x)?y/, 
     function($0, $1){ 
         return $1; 
     }));
+
+// See https://bugzilla.mozilla.org/show_bug.cgi?id=476146
+assertEquals("bbc,b", /^(b+|a){1,2}?bc/.exec("bbc"));
+assertEquals("bbaa,a,,a", /((\3|b)\2(a)){2,}/.exec("bbaababbabaaaaabbaaaabba"));
+