regexr is a powerful tool for debugging existing regexes and creating new ones. In this lesson, we‘ll use the app to create a regex that matches Twitter-style mentions in a string. It will go over a few regex concepts including capture groups, character sets, and flags.
regexr.com/4lq4d
[Javascript] Construct a Regex to Match Twitter Mentions with Regexr
原文：https://www.cnblogs.com/Answer1215/p/11598000.html