How to check if a string contains special characters (characters other than a-z 0-9 and _) with regex

Question

I have a form where users write their username, and I want to check if their username has special characters in it. (characters other than az 0-9 and _)

How can I do that with regex?

Answer 1

You can use character class ( \\W ) which means anything except alphabets, digits and _

 const strArr = [`Dragon!"£123`, `Clown %^☻#52_`, `Fish_12354`] let check = (str) => console.log(str, /\\W/.test(str)) strArr.forEach(check)