That regex doesn't match 720p on regexone (and shouldn't - it has required spaces in it). You're getting a tick for the bottom item because it's not supposed to

That regex doesn't match 720p on regexone (and shouldn't - it has required spaces in it). You're getting a tick for the bottom item because it's not supposed to match that case. As for your question, it generally depends how they're called - eg. in Python's re module, whether you call search() or match(). You can force a regex to match the entire string by adding ^ and $.