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@ 2016-07-20T22:56:19Z

<?php

$subject = '512345678';

$failingPattern = '/^(?:[3-5789]\d{8})$/x';

$result = preg_match($failingPattern , $subject, $groups, PREG_OFFSET_CAPTURE);

var_dump($result, $groups);
var_dump(PCRE_VERSION);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive previewkey bindings

24.84 ms | 405 KiB | 5 Q