Regex Editor & Tester

This regular expression matches an ISO 8601 formatted date and time string in UTC. It strictly validates the year, month, day, hour, minute, and second components, ensuring they fall within valid calendar and time ranges. Additionally, it supports an optional millisecond component (represented by a dot and three digits) and requires the timestamp to end with a 'Z', indicating the Zulu time zone. The global and multiline flags allow it to find multiple matches across a multiline string.