public static Set<Emoji> getForTag(String tag) {
    if (tag == null) {
      return null;
    }
    return EMOJIS_BY_TAG.get(tag);
  }
Returns all the {@link com.vdurmont.emoji.Emoji}s for a given tag.

@param tag the tag

@return the associated {@link com.vdurmont.emoji.Emoji}s, null if the tag
is unknown
src/main/java/com/vdurmont/emoji/EmojiManager.java