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run code in 150+ php & hhvm versions
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<?php $value = 'adsfå'; var_dump(preg_match('/^[a-zA-ZåäöÅÄÖüÜéÉèÈêâÊÂëËæÆØø.,\' -]*$/u', $value));
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1)
Output for 4.3.0 - 4.3.2
int(0)