Cleanup of mjsunit.js code and make assertEquals more strict.

test/mjsunit/regexp-static.js

 // Copyright 2008 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 116 matching lines @@
 }
 
 // String.prototype.replace must interleave matching and replacing when a
 // global regexp is matched and replaced with the result of a function, in
 // case the function uses the static properties of the regexp constructor.
 re = /(.)/g;
 function f() { return RegExp.$1; };
 assertEquals('abcd', 'abcd'.replace(re, f));
 
 // lastParen where the last parenthesis didn't match.
-assertEquals("foo,", /foo(?:a(x))?/.exec("foobx"), "lastParen setup");
+assertEquals(["foo",undefined], /foo(?:a(x))?/.exec("foobx"),
+             "lastParen setup");
 assertEquals("", RegExp.lastParen, "lastParen");
 
 // The same test for $1 to $9.
 for (var i = 1; i <= 9; i++) {
   var haystack = "foo";
   var re_text = "^foo";
   for (var j = 0; j < i - 1; j++) {
     haystack += "x";
     re_text += "(x)";
   }
@@ skipping 10 matching lines @@
 RegExp.multiline = "foo";
 assertTrue(typeof RegExp.multiline == typeof Boolean(), "RegExp.multiline coerces values to booleans");
 RegExp.input = Number();
 assertTrue(typeof RegExp.input == typeof String(), "RegExp.input coerces values to booleans");
 
 // Ensure that we save the correct string as the last subject when
 // we do a match on a sliced string (the top one not the underlying).
 var foo = "lsdfj sldkfj sdklfj læsdfjl sdkfjlsdk fjsdl fjsdljskdj flsj flsdkj flskd regexp: /foobar/\nldkfj sdlkfj sdkl";
 assertTrue(/^([a-z]+): (.*)/.test(foo.substring(foo.indexOf("regexp:"))), "regexp: setup");
 assertEquals("regexp", RegExp.$1, "RegExp.$1");