LayoutTests/fast/regex/resources/slow.js - WebKit - Git at Google

 description(
 'Test for expressions that would hang when evaluated due to exponential matching behavior. If the test does not hang it is a success.'
 );

 shouldBe('/(?:[^(?!)]||){23}z/.test("/(?:[^(?!)]||){23}z/")', 'false');

 var successfullyParsed = true;
	description(
	'Test for expressions that would hang when evaluated due to exponential matching behavior. If the test does not hang it is a success.'
	);

	shouldBe('/(?:[^(?!)]\|\|){23}z/.test("/(?:[^(?!)]\|\|){23}z/")', 'false');

	var successfullyParsed = true;