def core__get_string_inside_strings(string, marker1, marker2)
      string[/#{Regexp.escape(marker1)}(.*?)#{Regexp.escape(marker2)}/m, 1]
    end
def core__get_string_inside_strings(string, marker1, marker2)
      string[/#{Regexp.escape(marker1)}(.*?)#{Regexp.escape(marker2)}/m, 1]
    end
This function return the substring inside two strings.