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@ 2013-11-13T10:51:38Z

<?php

$host = 'localhost';


if (preg_match('#^[-._A-Za-z0-9]{,255}$#', $host)) {
    print 'true';
}

print 'false';

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

41.22 ms | 402 KiB | 5 Q