$re = '/^((feature|bugfix|hotfix)\/([a-zA-Z]{2,6}-\d{1,6}|NO-?JIRA)\-[a-zA-Z0-9-_]{1,30}|release\/\d+\.\d+\.?\d*)$/m';
$str = 'release/0.8
release/58.11
release/58.15.45
feature/VECTWO-1234-Something-Here
release/RC-0.8
release/58
feature/VECTWO-1234-Something-Really-Long-Too-Long-In-Fact';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php