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This page tests handling of parenthetical assertions.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS regex1.exec('xx') is ['xx','x']
PASS regex2.exec('baaabaac') is ['baaabaac','ba',undefined,'abaac']
PASS regex3.exec('aaab') is ['aab','a','aab']
PASS regex4.exec('aaab') is ['aab','a','aab']
PASS regex5.exec('P11') is ['P11','1','1']
PASS regex6.exec('ababbbcbc') is ['ababb','bb','b']
PASS regex7.exec('xx') is ['xx','x']
PASS regex8.exec('xx') is ['xx','x','x']
PASS regex9.exec('xy') is null
PASS regex10.exec('xy') is null
PASS regex11.exec('xy') is null
PASS regex12.exec('x') is null
PASS regex12.exec('xx') is ['xx','x']
PASS regex12.exec('xxy') is ['xx','x']
PASS regex13.exec('xzzzx') is ['xzzzx','x']
PASS regex13.exec('xzzzxy') is ['xzzzx','x']
PASS regex14.exec('aabc') is ['aabc','a','bc']
PASS regex14.exec('aabcx') is ['aabc','a','bc']
PASS regex15.exec('aabc') is ['aabc','a','bc']
PASS regex15.exec('aabcx') is ['aabc','a','bc']
PASS regex16.exec('ab') is null
PASS regex16.exec('abc') is ['abc','bc']
PASS regex17.exec('ab') is ['a','ab']
PASS regex17.exec('abc') is ['a','ab']
PASS regex18.exec('x') is ['x','']
PASS regex18.exec('xx') is ['x','xx']
PASS regex18.exec('xxx') is ['x','xx']
PASS regex19.exec('x') is ['x','',undefined]
PASS regex19.exec('xx') is ['x','xx','xx']
PASS regex19.exec('xxx') is ['x','xx','xx']
PASS regex20.exec('x') is null
PASS regex20.exec('xx') is ['x','xx']
PASS regex20.exec('xxx') is ['x','xx']
PASS regex21.exec('aab') is ['aab']
PASS regex22.exec('55up') is null
PASS regex23.exec('ax') is null
PASS regex24.exec('x') is null
PASS successfullyParsed is true

TEST COMPLETE