module Regexp::Lexer

def self.merge_literal(current)

get normalized (as in the case of posix/bre) and end up becoming literals.
called by scan to merge two consecutive literals. this happens when tokens

def self.merge_literal(current)
  last = @tokens.pop
  replace = Regexp::Token.new(:literal, :literal, last.text + current.text,
                                 last.ts, current.te, @nesting, @set_nesting)
end

Class Methods