I have added valid regex for Afghanistan, Yemen and Western Sahara.
I will add more regex for missing countries mainly Caribbean and small Island.
Solved and added test for issue #1761

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)

@ezkemboi can you please review this PR ?

I apologise for being a little late for this PR because I was busy at work.
Could you please provide a place where I can learn regex because I'm having trouble developing regex for the Caribbean and tiny islands?

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Thankyou for the contribution 🎉