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run code in 150+ php & hhvm versions
Bugs & Features
<? echo preg_match('~^[0-9a-zA-ZäöüÄÖÜß_]{3,20}$~', 'bobßä'); ?>
based on hfWMV
Output for 5.4.34 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1
Output for 4.3.0 - 5.4.32
<? echo preg_match('~^[0-9a-zA-ZäöüÄÖÜß_]{3,20}$~', 'bobßä'); ?>