src/v8/test/mjsunit/regress/regress-254.js

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// See: http://code.google.com/p/v8/issues/detail?id=254

// RegExp with global flag: exec and test updates lastIndex.
var re = /x/g;

assertEquals(0, re.lastIndex, "Global, initial lastIndex");

assertTrue(re.test("x"), "Global, test 1");
assertEquals(1, re.lastIndex, "Global, lastIndex after test 1");
assertFalse(re.test("x"), "Global, test 2");
assertEquals(0, re.lastIndex, "Global, lastIndex after test 2");

assertEquals(["x"], re.exec("x"), "Global, exec 1");
assertEquals(1, re.lastIndex, "Global, lastIndex after exec 1");
assertEquals(null, re.exec("x"), "Global, exec 2");
assertEquals(0, re.lastIndex, "Global, lastIndex after exec 2");

// RegExp without global flag: exec and test leavs lastIndex at zero.
var re2 = /x/;

assertEquals(0, re2.lastIndex, "Non-global, initial lastIndex");

assertTrue(re2.test("x"), "Non-global, test 1");
assertEquals(0, re2.lastIndex, "Non-global, lastIndex after test 1");
assertTrue(re2.test("x"), "Non-global, test 2");
assertEquals(0, re2.lastIndex, "Non-global, lastIndex after test 2");

assertEquals(["x"], re2.exec("x"), "Non-global, exec 1");
assertEquals(0, re2.lastIndex, "Non-global, lastIndex after exec 1");
assertEquals(["x"], re2.exec("x"), "Non-global, exec 2");
assertEquals(0, re2.lastIndex, "Non-global, lastIndex after exec 2");