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<?php $kw = " asdsdfsdf \t as "; $pattern = '/^((?![[:cntrl:]' . preg_quote(',!@%^*()={};~`<>?\|', '/') . ']).)*$/u'; var_dump($pattern); var_dump(var_export($pattern, true)); var_dump(preg_match($pattern, $kw));
Output for git.master, git.master_jit, rfc.property-hooks
string(56) "/^((?![[:cntrl:],\!@%\^\*\(\)\=\{\};~`\<\>\?\\\|]).)*$/u" string(72) "'/^((?![[:cntrl:],\\!@%\\^\\*\\(\\)\\=\\{\\};~`\\<\\>\\?\\\\\\|]).)*$/u'" int(0)

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