Validate a number using regex

I would like to validate numbers using regex, and thought that a search both here on the net would produce what I was looking for, but...
The closest I can get to a number validation sequence (thankyou www.interviewjava.com) was the following:
"^[-+]?[0-9]*\\.?[0-9]+$"
but unfortunately it is incomplete. The explanation of the code is as follows:
* ^[-+]? : Starts with an optional + or - sign. [0-9]* : May have
* one or more digits. \\.? : May contain an optional . (decimal
* point) character. [0-9]+$ : ends with numeric digit.
Can anyone point me to a validation sequence that includes the comma for separating thousands? (The comma can appear multiple times, and is always followed by three digits).
I'd be very grateful for any help on this. Thankyou.

Thank you very much for your incredibly fast reply.
Did you cook that up yourself in the seven minutes since I posted the question, or did you have it somewhere ready?

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