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] range operator (..) receiving signals recursive directory listing redo operator references regular expressions character classes flags /x further reading introduction match variables persistence matches /s binding operator case-insensitive m// multiline text metacharacters option modifiers combining parentheses pattern test code powerful precedence quantifiers greedy shortcuts, negating text case text file update text replacement, global text substitutions whitespace | (bar) renaming files return operator return values non-scalar subroutines reverse operator |