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@ 2012-12-19T19:05:00Z

<?php
$file = '0004f21edd14-boot.cfg';
echo preg_match('^0004f2([a-fA-F0-9]{6})-(?:boot\.log|app\.log|now-boot\.log)$', $file, $d);
print_r($d);

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

39.94 ms | 402 KiB | 5 Q