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@ 2014-05-28T14:15:31Z

<?php

//$p = '~(?J)(z?)((?1)(?P<group>b)|(?P<group>a))ba~'; // works
$p = '~(?J)(z?)((?1)(?P<group>b)|(?P<group>a))b(?P=group)~'; // fails
$s = 'aba';


if (preg_match($p, $s, $m)) {
    var_dump($m);
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

40.35 ms | 402 KiB | 5 Q