test/mjsunit/regexp-string-methods.js

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// 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);