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@ 2015-07-07T14:19:34Z

<?php
$domain='rückführung-ins-licht.de';
if(preg_match('/[äöüß]/', $domain)){
				echo "IDN";
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

46.43 ms | 402 KiB | 5 Q