Add regex search support

[jayDevCodes]

Allow users to search using regular expressions instead of plain text.

[Wuzu11517]

Hey, I'd be more than happy to work on this issue! Would it be possible to assign this issue to me

[jayDevCodes]

@Wuzu11517 Thanks for volunteering — that's great!

Please go ahead and work on this. Could you:

Create a branch named feature.
Push a draft PR when you have a basic implementation so I can review.
Mention this issue number in the PR description.
I've added the help wanted and in progress labels and will assign you to this issue. Let me know if you need any setup help. 🙂