Validate user input for username field when sign up

[tehseen01]

As a developer, I want to prevent the user from entering invalid characters in the username field, such as uppercase letters, space and special symbols other than - and _ . This would ensure the consistency and security of the user data.

Acceptance criteria:

• The username field should only accept lowercase letters, numbers, hyphens, dot and underscores
• The username field should display an error message if the user enters any invalid character
• The username field should not allow the user to submit the form until the error is resolved

[bonapartbon]

@tehseen01 can i work on this issue?

[tehseen01]

Sure, feel free to work on this issue. Please make sure to follow the contribution guidelines and check for any updates before submitting your pull request

[bonapartbon]

@tehseen01 i have some problems when running this repo, it stucks at 404 page.

[bonapartbon]

Sure, feel free to work on this issue. Please make sure to follow the contribution guidelines and check for any updates before submitting your pull request

yes just saw you update README. thanks

[tehseen01]

if you have not setup backend then you will see 404 error

[tehseen01]

if you don't want to setup backend then simply you can just paste this url in the .env file

NEXT_PUBLIC_API_URL= https://social-api-three.vercel.app/api/

[bonapartbon]

@tehseen01 i pushed into my fork but when i click compare & pull request. this shows up.