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@ 2013-03-29T06:50:13Z

<?php
$search_string = '12312ddddD';
if (preg_match('/^((?i)[0-9a-z])+$/', $search_string)) { 
    echo '(y)';
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

44.54 ms | 402 KiB | 5 Q