[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [Z] named capture negated character classes .NET framework anchors and zero-width tests character classes and class-like constructs character representations comments and mode modifiers grouping, capturing, conditional, and control NFA engines POSIX Traditional Nondeterministic Finite Automaton (NFA) |