Match constructor Null safety

1. Dart
2. dart:core
3. Match
4. Match constructor

Match class

1. Constructors
2. Match
3. Properties
4. end
5. groupCount
6. hashCode
7. input
8. pattern
9. runtimeType
10. start
11. Methods
12. group
13. groups
14. noSuchMethod
15. toString
16. Operators
17. operator ==
18. operator []