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run code in 150+ php & hhvm versions
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<?php $course_id = "SW_3200R50S14C"; preg_match("/[0-9]+/",$course_id, $matches); print_r($matches); preg_match("/R[0-9]+/",$course_id, $matches); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 3200 ) Array ( [0] => R50 )