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@ 2014-03-15T15:37:31Z

<?php

$pattern = '/.*(?!(?<!%)[A-Z0-9]{2})+.*/';
$string = 'a%C3%B1o';

$res = preg_match ( $pattern, $string, $result );

var_dump( $res, $result );

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

40.37 ms | 402 KiB | 5 Q