dateTimeExp top-level property
Implementation
final RegExp dateTimeExp = RegExp(
r'(?<year>[0-9]{4})(-(?<month>0[1-9]|1[0-2])(-(?<day>0[1-9]|[1-2][0-9]|3[0-1])(T((?<hour>[01][0-9]|2[0-3])(:(?<minute>[0-5][0-9])(:(?<second>[0-5][0-9]|60)(\.(?<fraction>[0-9]+))?)?)?)?(?<timezone>Z|(\+|-)([0-1][0-9]|2[0-3])(:[0-5][0-9])?)?)?)?)?');