Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] $ (dollar sign) () (parentheses) * (asterisk) 2nd + (plus sign) . (period) 2nd .. (double period) / (slash) // (double slash) 2nd ? (question mark) @ (at sign) [0-9] pattern (regular expressions) [^0-9] pattern (regular expressions) \ (backslash) ^ (caret) | (union operator) |