3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $pattern = '/.*(?!(?<!%)[A-Z0-9]{2})+.*/'; $string = 'a%C3%B1o'; $res = preg_match ( $pattern, $string, $result ); var_dump( $res, $result );
Output for 5.3.19 - 5.3.29, 5.4.9 - 7.1.0
int(1) array(1) { [0]=> string(8) "a%C3%B1o" }
Output for 5.2.0 - 5.3.18, 5.4.0 - 5.4.8
Warning: preg_match(): Compilation failed: nothing to repeat at offset 23 in /in/EN4QM on line 6 bool(false) NULL
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Compilation failed: nothing to repeat at offset 23 in /in/EN4QM on line 6 bool(false) array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 23 in /in/EN4QM on line 6 bool(false) array(0) { }