dateExp top-level property

RegExp dateExp
final

For reference purposes from the FHIR spec

Implementation

final RegExp dateExp = RegExp(
    r'(?<year>[0-9]([0-9]([0-9][1-9]|[1-9]0)|[1-9]00)|[1-9]000)(-(?<month>0[1-9]|1[0-2])(-(?<day>0[1-9]|[1-2][0-9]|3[0-1]))?)?');