Regular expression classification
Wildcards:., *, +,?
Range character:-
Exclude character class: ^
Positioning character class: ^, $
Span character class:\ n.m\}
Select character class: |
Grouping character class: ()
Wildcards:., *, +,?
Range character:-
Exclude character class: ^
Positioning character class: ^, $
Span character class:\ n.m\}
Select character class: |
Grouping character class: ()