updated email validation regex

[AdarshGT33]

Related Issue

Issue #138

Description

Updated the regex to validate only approved emails with approved domains

Type of PR

• [ ] Bug fix
• [X] Feature enhancement
• [ ] Documentation update
• [ ] Other (specify): ___

Screenshots / videos (if applicable)

[Attach any relevant screenshots or videos demonstrating the changes]

Checklist:

• [X ] I have performed a self-review of my code
• [X] I have read and followed the Contribution Guidelines.
• [X] I have tested the changes thoroughly before submitting this pull request.
• [X] I have provided relevant issue numbers, screenshots, and videos after making the changes.
• [X] I have commented my code, particularly in hard-to-understand areas.

Future Scope:

Why didn't we used Zod for validation? I argue that we should implement Zod. I didn't moved forward with it cause that would mean some major refactoring in the code and I was not sure about it. But I would say that Zod will make it easier and also this is the future scope for this functionality as regex are not the horse for the long run.

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[subhadeeproy3902]

@AdarshGT33 List ur contribution in the Contributing.ts file . Check or read Contributing.md