<?php # The problem, hyphen use within class in incorrect position. var_dump(preg_match('~[0-9\w-.]*~', '')); # The fix, or we escape the hyphen or we put it last var_dump(preg_match('~[0-9\w\-.]*~', '')); var_dump(preg_match('~[0-9\w.-]*~', ''));
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