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@ 2014-02-02T22:40:07Z

<?php
define('R_MD5_MATCH', '/^[a-f0-9]{32}$/i');

if(preg_match(R_MD5_MATCH, $input_string)) {
    echo "It matches.";
} else {
    echo "It does not match.";
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
define: documentation ( source)

preferences:dark modelive preview

35.82 ms | 402 KiB | 5 Q