3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<? echo preg_match('~^[0-9a-zA-ZäöüÄÖÜß_-.]{3,20}$~', 'bobßä'); ?>
based on fTddl
Output for 5.4.34 - 7.1.0
Warning: preg_match(): Compilation failed: range out of order in character class at offset 27 in /in/b5FZL on line 3
Output for 4.3.0 - 5.4.32
<? echo preg_match('~^[0-9a-zA-ZäöüÄÖÜß_-.]{3,20}$~', 'bobßä'); ?>