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<?php $s = "http://ad.zanox.com/ppc/?23012557C80290415&ULP=[[0000011028nubuck%20kaki&eurl=http%3A%2F%2Fwww.sarenza.nl%2Fbirkenstock-madrid-flor-w-s780328-p0000011028]]"; //var_dump(stristr($s,"_",true)); preg_match('~[(](.+?)[)]~',$s,$matches); var_dump($matches); ?>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(0) { }

preferences:
252.44 ms | 405 KiB | 362 Q