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@ 2017-05-18T15:03:57Z

<?php

$string = '--';

$doesNotMatchInPhp7 = '/(?|(---)|(-))\1/';
$matchesInPhp7 = '/(?|(-)|(---))\1/';

var_dump(preg_match($doesNotMatchInPhp7, $string));
var_dump(preg_match($matchesInPhp7, $string));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

23.95 ms | 405 KiB | 5 Q