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<?php $kw = " asdsdfsdf as "; $pattern = var_export('/^((?![[:cntrl:]' . preg_quote(',!@%^*()={};~`<>?\|', '/') . ']).)*$/u'); var_dump($pattern); var_dump(preg_match($pattern, $kw));
Output for git.master, git.master_jit, rfc.property-hooks
'/^((?![[:cntrl:],\\!@%\\^\\*\\(\\)\\=\\{\\};~`\\<\\>\\?\\\\\\|]).)*$/u'NULL Deprecated: preg_match(): Passing null to parameter #1 ($pattern) of type string is deprecated in /in/DpqAK on line 7 Warning: preg_match(): Empty regular expression in /in/DpqAK on line 7 bool(false)

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