用于 JavaScript 的简单用户名 RegEx

Question

I have a username field that can consist of A-Za-z0-9_ and must be between 3 and 20 characters.

In python, it's simply: ^[A-Za-z0-9_]{3,20}\\Z

But I can't seem to get it to work in JavaScript. I've tried:

/^[A-Za-z0-9_]{3,20}\\/
/^[A-Za-z0-9_]{3,20}\\Z/
/^[A-Za-z0-9_]{3,20}+$/
/^[A-Za-z0-9_]{3,20}/

What am I missing here? Thank you.

Answer 1

Use: /^[A-Za-z0-9_]{3,20}$/g

 console.log(/^[A-Za-z0-9_]{3,20}$/g.test("spectric")) console.log(/^[A-Za-z0-9_]{3,20}$/g.test("spectric#"))