[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W]
* (repeat)
+ (repeat)
? (repeat)
^ metacharacter
_1
_2
_3