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<?php $allowed_chars = 'a\-z 0\-9~%\.\:_\-'; $str = 'renewal'; if ( ! preg_match("/^[".preg_quote($allowed_chars)."]+$/i", $str)){ echo "Unallowed!!!!"; }else{ echo "Looks fine"; }
Output for git.master, git.master_jit, rfc.property-hooks
Unallowed!!!!

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