Just to avoid a server roundtrip, we can validate usernames in the frontend login form with the same RegEx that the backend uses: ```js /^[A-Za-z0-9]+(?:[_][A-Za-z0-9]+)*_?$/i ```
Just to avoid a server roundtrip, we can validate usernames in the frontend login form with the same RegEx that the backend uses:
/^[A-Za-z0-9]+(?:[_][A-Za-z0-9]+)*_?$/i