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<? echo preg_match('~[0-9a-zA-ZäöüÄÖÜß]~', 'ß'); ?>
based on maUMh
Output for 5.4.34 - 7.1.7
1
Output for 4.3.0 - 5.4.32
<? echo preg_match('~[0-9a-zA-ZäöüÄÖÜß]~', 'ß'); ?>