Regex Tester & Validator
Test, validate and match regular expressions
Test, validate and match regular expressions
Matches ISO 8601 formatted datetime strings, including optional negative years, date components (YYYY-MM-DD), time components (HH:MM:SS), optional fractional seconds, and an optional UTC 'Z' timezone indicator. This pattern is commonly used for validating and parsing standardized datetime formats in APIs, databases, and logging systems. Note that it does not validate actual calendar correctness (e.g., February 31st would match).