Mini Chat App (Chat Room)

This is a retrospective update because I am mistaken that I already upload the content. That day, I add a feature to validate chat room number. It will contain 6 numeral digits because I think it is easy to remember for a mini chat app.

Regular expression is one of the topics that I always have to search with Google. I do remember basic stuffs such as starting and ending characters. It is a universally accepted way to detect some pattern on a string. That is why it is called regular expression. Regular expression is built into JavaScript. It can be used like this /regular$/i. It is a regular expression that will match string that have the word "regular" at the end of a line. The letter "i" at the end means it is case-insensitive. REGULAR, regular, REgular are the same in this pattern.