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@ 2013-11-21T19:15:20Z

<?php
echo (!preg_match("/^[a-z]+$/i", '4567')) ? 'false' : 'true';
echo "\n";
echo (!preg_match("/^[a-z]+$/i", '4567A')) ? 'false' : 'true';

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

42.78 ms | 402 KiB | 5 Q