- preg_match: documentation ( source)
- print_r: documentation ( source)
<?php
$course_id = "SW_3200R50S14C";
$matches = array();
preg_match("/[0-9]+/",$course_id, $matches);
print_r($matches);
$matches = array();
preg_match("R/[0-9]+/",$course_id, $matches);
print_r($matches);