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@ 2014-07-21T15:45:31Z

<?php
$string = 'a';

if (!preg_match('/^[a-z0-9].*[a-z0-9]$/i', $string)) {
    print 'FAIL';
} else {
    print 'OK';
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

40.22 ms | 402 KiB | 5 Q