Change StringSearch to not call exec and build unnecessary intermediate array.

src/string.js

 // Copyright 2006-2009 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 504 matching lines @@
   for (var j = 0; j < m; j++) {
     parameters[j] = CaptureString(subject, matchInfo, j);
   }
   parameters[j] = index;
   parameters[j + 1] = subject;
   return replace.apply(null, parameters);
 }
 
 
 // ECMA-262 section 15.5.4.12
-function StringSearch(re) {
+function StringSearch(re) { 
   var regexp = new $RegExp(re);
   var s = TO_STRING_INLINE(this);
-  var last_idx = regexp.lastIndex; // keep old lastIndex
-  regexp.lastIndex = 0;            // ignore re.global property
-  var result = regexp.exec(s);
-  regexp.lastIndex = last_idx;     // restore lastIndex
-  if (result == null)
-    return -1;
-  else
-    return result.index;
+  var match = DoRegExpExec(regexp, s, 0);
+  if (match) {
+    lastMatchInfo = match;
+    return match[CAPTURE0];
+  }
+  return -1;
 }
 
 
 // ECMA-262 section 15.5.4.13
 function StringSlice(start, end) {
   var s = TO_STRING_INLINE(this);
   var s_len = s.length;
   var start_i = TO_INTEGER(start);
   var end_i = s_len;
   if (end !== void 0)
@@ skipping 440 matching lines @@
     "small", StringSmall,
     "strike", StringStrike,
     "sub", StringSub,
     "sup", StringSup,
     "toJSON", StringToJSON
   ));
 }
 
 
 SetupString();