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@ 2014-09-20T08:39:30Z

<?php
// This is valid, both opening ( and closing )
var_dump(preg_match('~Valid(Regular)Expression~', null) === false);
// This is invalid, no opening ( for the closing )
var_dump(preg_match('~InvalidRegular)Expression~', null) === false);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

38.17 ms | 402 KiB | 5 Q