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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 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(1) int(0) int(1) int(0)
Output for hhvm-3.10.0

Process exited with code 153.