module Regexp::Lexer

def self.break_literal(token)

into two separate tokens when it is followed by a quantifier
called by scan to break a literal run that is longer than one character 
def self.break_literal(token)
  text = token.text
  if text.scan(/./mu).length > 1
    lead = text.sub(/.\z/mu, "")
    last = text[/.\z/mu] || ''
    if RUBY_VERSION >= '1.9'
      lead_length = lead.bytesize
      last_length = last.bytesize
    else
      lead_length = lead.length
      last_length = last.length
    end
    @tokens.pop
    @tokens << Regexp::Token.new(:literal, :literal, lead, token.ts,
                (token.te - last_length), @nesting, @set_nesting, @conditional_nesting)
    @tokens << Regexp::Token.new(:literal, :literal, last,
                (token.ts + lead_length),
                token.te, @nesting, @set_nesting, @conditional_nesting)
  end
end