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regex for ISO dates
^(\d{4}-\d{2}-\d{2})(T\d{2}:\d{2}:\d{2}(\.\d{3})?(Z|[+-]\d{2}:\d{2})?)?$
matches parts of the iso date into groups, so that you can for example sort by iso dates
^(\d{4}-\d{2}-\d{2})(T\d{2}:\d{2}:\d{2}(\.\d{3})?(Z|[+-]\d{2}:\d{2})?)?$
matches parts of the iso date into groups, so that you can for example sort by iso dates