I have this hostname regex that I’d like to expand on a bit. It

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Editorial Team

Asked: May 21, 20262026-05-21T19:59:01+00:00 2026-05-21T19:59:01+00:00

I have this hostname regex that I’d like to expand on a bit. It will match hostnames such as:

yahoo.com

mail.yahoo.com

but will also match

&^%yahoo.com
etc…

(\w+\.\w+\.\w+)

Can someone tell me what I need to add to only allow letters, numbers and periods?

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Editorial Team · Answer 1 · 2026-05-21T19:59:02+00:00

Editorial Team

Try using
[a-zA-Z0-9\.]+ instead of \w+.

So all in all this will be:

([a-zA-Z0-9\.]+\.[a-zA-Z0-9\.]+\.[a-zA-Z0-9\.]+)

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