nashorn/test/script/basic/JDK-8137240.js

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/**
 * JDK-8137240: Negative lookahead in RegEx breaks backreference
 *
 * @test
 * @run
 */


Assert.assertEquals('aa'.replace(/(a)(?!b)\1/gm, 'c'), 'c');

var result = 'aa'.match(/(a)(?!b)\1/);
Assert.assertTrue(result.length === 2);
Assert.assertTrue(result[0] === 'aa');
Assert.assertTrue(result[1] === 'a');

result = 'aa'.match(/(a)(?!(b))\2(a)/);
Assert.assertTrue(result.length === 4);
Assert.assertTrue(result[0] === 'aa');
Assert.assertTrue(result[1] === 'a');
Assert.assertTrue(result[2] === undefined);
Assert.assertTrue(result[3] === 'a');