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<?php $test = "case ('this_is__test_innit'):"; if (preg_match('/[case][\s]*?[(][\'|\"]/', $test)) { print 'match'; } else { print 'no match'; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
match