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@ 2013-01-17T08:48:23Z

<?php

$txt = 'aab
bbcdaddeeff';
    if (preg_match('/([a-z])\1{2,}/', $txt))
        echo 'The string is not valid';

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

40.32 ms | 402 KiB | 5 Q