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run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = "QR12345678"; var_dump( preg_match('/^[A-Z]{1,3}[0-9]{4,10}$/', $str) ); var_dump( preg_match('/^[A-Z]{1,3}?[0-9]{4,10}$/', $str) ); var_dump( preg_match('/([A-Z]{1,3})?[0-9]{4,10}$/', $str) ); var_dump( preg_match('/^([A-Z]{1,3})?[0-9]{4,10}$/', $str) ); var_dump( preg_match('/[A-Z]{0,3}[0-9]{4,10}/', $str) ); var_dump( preg_match('/([A-Z]{1,3})*[0-9]{4,10}$/', $str) );
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(1) int(1) int(1) int(1) int(1) int(1)
Output for hhvm-3.10.0

Process exited with code 153.