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<?php var_dump(preg_match('s([0-9]{1-3}\.){3}[0-9]{1-3}s', '192.168.1.1'));
Output for 4.3.11 - 7.2.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/PYCv1 on line 2 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/PYCv1 on line 2 bool(false)