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@ 2012-11-05T14:31:11Z

<?php
$color='33333';

if (!preg_match("/^[A-Fa-f0-9]{6}$/", $color)) {
    var_dump(array("result"=>"error: Invalid Color $color"));
} else {
    var_dump(array("result"=>"color is valid"));
}

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

38.68 ms | 402 KiB | 5 Q