Regex Editor & Tester

Matches real-world UTC timezone offsets: negative offsets from -00:00 to -12:00 in whole hours plus -03:30 (Newfoundland) and -09:30 (Marquesas), and positive offsets from +00:00 to +14:00 plus half-hour variants (+03:30, +04:30, +05:30, +06:30, +09:30, +10:30) and quarter-hour variants (+05:45 Nepal, +12:45 Chatham Islands). Useful for validating the offset portion of ISO 8601 timestamps, datetime strings, or log entries. The gm flags enable finding all matches across multiple lines.