Regex Editor & Tester

Matches RFC 3339 date-time strings consisting of a date (YYYY-MM-DD), a literal 'T' separator, a time (HH:MM:SS) with optional fractional seconds, and an optional timezone designator ('Z' or ±HH:MM offset). Capture groups extract the date, time, and timezone components separately for easy processing. Commonly used to validate timestamps in APIs, logs, and ISO 8601-compliant data, with multiline flags enabling validation of multiple entries at once.