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<?php $string1 = "sqrtpdrt"; // matched $string2 = "qwntfschrprtkjs"; // not matched (contains chr group) $regex = '/^(?i=.*[bcdfghjklmnpqrstvwxz]{4})(?!.*chr)/i'; var_dump(preg_match($regex, $string1)); var_dump(preg_match($regex, $string2));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Compilation failed: unrecognized character after (? or (?- at offset 4 in /in/lF3uH on line 7 bool(false) Warning: preg_match(): Compilation failed: unrecognized character after (? or (?- at offset 4 in /in/lF3uH on line 8 bool(false)

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