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@ 2017-05-18T14:31:49Z

<?php

$string = '12-34-56-78';
$pattern = '/^\d{2}(?|(---)|(-)|(\.)|(\:))\d{2}\1\d{2}\1\d{2}$/';
$result = preg_match($pattern, $string);
var_dump($result);
var_dump(PCRE_VERSION);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

105.59 ms | 1989 KiB | 5 Q