class CodeRay::Scanners::Ruby::StringState

def heredoc_pattern delim, interpreted, indented
  # delim = delim.dup  # workaround for old Ruby
  delim_pattern = Regexp.escape(delim)
  delim_pattern = / (?:\A|\n) #{ '(?>[ \t]*)' if indented } #{ Regexp.new delim_pattern } $ /x
  if interpreted
    / (?= #{delim_pattern}() | \\ | \# [{$@] ) /mx  # $1 set == end of heredoc
  else
    / (?= #{delim_pattern}() | \\ ) /mx
  end
end