When using the Twitter API you get emojis as unicode characters. You can then easily parse out and display emojis as pictures. One example of such a parsing tool is Twemoji, which is the official emoji parsing tool from Twitter. In the twemoji.js file there is a long regular expression they use to parse out the emojis.
However, this file has not been updated in two years, and there are many emojis missing from Twemoji that are displayed just fine on twitter.com.
Does anybody know of any other well maintained list of current emojis supported by twitter.com? A bonus would be that they use/provide a regular expression I can import into my own code.