Issue: Incorrect Input Validation for Email/Password in Authentication

Observed Problem:

•On the login page of ArgueHub, an error message appears:
"The string did not match the expected pattern."
This suggests that the input validation for email or password is either too strict or incorrectly implemented.

Possible Causes & Fixes:

Email Regex Issue:
Your system might be using an overly restrictive regex pattern for email validation.
Example: If the backend only accepts example@domain.com but rejects subdomains (user@mail.co.in) or special characters, valid emails might fail.
Fix: Use a standard email regex.

•Frontend vs. Backend Validation Mismatch:

The frontend might allow certain email/password formats that the backend rejects.
Fix: Ensure that the same regex patterns and validation rules are enforced both in the frontend and backend.

•Unclear Error Messaging:
The generic message "The string did not match the expected pattern" does not tell the user exactly what is wrong.
Fix: Improve the error message to be specific, such as:
"Invalid email format. Use example@domain.com"
"Password must be at least 8 characters, include a number and a special symbol"