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@ 2014-07-11T10:04:51Z

<?php

$t = 'lang="cs-CZ"';
var_dump(preg_match("~lang=(\"|')cs(_\-)cz(\"|')~i", $html, $langPreg));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

36.9 ms | 402 KiB | 5 Q