Regex Editor & Tester

This regular expression matches a literal dot followed by one or more occurrences of the characters 'm', 'p', or '3'. It is typically used to find .mp3 audio file extensions in a string. However, due to its use of a character class, it will loosely match invalid extensions like '.ppp', '.3m', or '.m' as well. It should be replaced with \.(?:mp3) if strict matching for the exact '.mp3' string is required.