3v4l.org

run code in 150+ php & hhvm versions
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<? echo preg_match('~^[0-9 a-z A-Z äöü ÄÖÜ ß]{3,20}$~', 'bobßä'); ?>
based on 9q8Cb
Output for 5.4.34 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
1
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.4.32
<? echo preg_match('~^[0-9 a-z A-Z äöü ÄÖÜ ß]{3,20}$~', 'bobßä'); ?>