extract_file_and_line_number

# File actionpack/lib/action_dispatch/middleware/exception_wrapper.rb, line 135
    def extract_file_and_line_number(trace)
      # Split by the first colon followed by some digits, which works for both
      # Windows and Unix path styles.
      file, line = trace.match(/^(.+?):(\d+).*$/, &:captures) || trace
      [file, line.to_i]
    end