Avoids allocating a JSArray of capture information on each non-global...

test/mjsunit/regexp-string-methods.js

Index: test/mjsunit/regexp-string-methods.js
===================================================================
--- test/mjsunit/regexp-string-methods.js	(revision 0)
+++ test/mjsunit/regexp-string-methods.js	(revision 0)
@@ -0,0 +1,22 @@
+// Regexp shouldn't use String.prototype.slice()
+var s = new String("foo");
+assertEquals("f", s.slice(0,1));
+String.prototype.slice = function() { return "x"; }
+assertEquals("x", s.slice(0,1));
+assertEquals("g", /g/.exec("gg"));
+
+// Regexp shouldn't use String.prototype.charAt()
+var f1 = new RegExp("f", "i");
+assertEquals("F", f1.exec("F"));
+assertEquals("f", "foo".charAt(0));
+String.prototype.charAt = function(idx) { return 'g'; };
+assertEquals("g", "foo".charAt(0));
+var f2 = new RegExp("[g]", "i");
+assertEquals("G", f2.exec("G"));
+assertTrue(f2.ignoreCase);
+
+// On the other hand test is defined in a semi-coherent way as a call to exec.
+// 15.10.6.3
+// SpiderMonkey fails this one.
+RegExp.prototype.exec = function(string) { return 'x'; }
+assertTrue(/f/.test('x'));