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@ 2014-05-28T09:37:54Z

<?php

var_dump(
    preg_match('/^pa\d{2}$/', 'pa04'),
    preg_match('/^pa\d{2}$/', 'c01'),
    preg_match('/^c\d{2}$/', 'c02'),
    preg_match('/^c\d{2}$/', 'pa03')
);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

37.63 ms | 402 KiB | 5 Q