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<?php var_dump( preg_match('/^pa\d{2}$/', 'pa04'), preg_match('/^pa\d{2}$/', 'c01'), preg_match('/^c\d{2}$/', 'c02'), preg_match('/^c\d{2}$/', 'pa03'), );
Output for 5.3.0 - 5.4.28
Parse error: syntax error, unexpected ')' in /in/hsFv0 on line 8
Process exited with code 255.