xml_name_escape

# File activesupport/lib/active_support/core_ext/erb/util.rb, line 142
    def xml_name_escape(name)
      name = name.to_s
      return "" if name.blank?
      return name if name.match?(SAFE_XML_TAG_NAME_REGEXP)

      starting_char = name[0]
      starting_char.gsub!(INVALID_TAG_NAME_START_REGEXP, TAG_NAME_REPLACEMENT_CHAR)

      return starting_char if name.size == 1

      following_chars = name[1..-1]
      following_chars.gsub!(INVALID_TAG_NAME_FOLLOWING_REGEXP, TAG_NAME_REPLACEMENT_CHAR)

      starting_char << following_chars
    end