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run code in 150+ php & hhvm versions
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<?php $pattern = '/.*(?<!%)([A-Z0-9])?[A-Z]+.*/'; $string = 'aA%C3%B1o'; $res = preg_match ( $pattern, $string, $result ); var_dump( $res, $result );
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(1) array(1) { [0]=> string(9) "aA%C3%B1o" }
Output for hhvm-3.10.0

Process exited with code 153.