code: function getNormalizedTag(tag_buffer) {
  		var match = NORMALIZE_TAG_REGEX.exec(tag_buffer);
  		return match ? match[1].toLowerCase() : null;
  	}
docs: Get the tag name
  
  @author   Jelle De Loecker   <jelle@develry.be>
  @since    0.6.3
  @version  0.6.3
  
  @param    {String}   tag_buffer
  
  @return   {String}   The lowercase tag name