RegEx pattern any two letters followed by six numbers

Question

Please assist with the proper RegEx matching. Any 2 letters followed by any combination of 6 whole numbers.

These would be valid: 
RJ123456
PY654321
DD3212         


        

Answer 1

I depends on what is the regexp language you use, but informally, it would be:

[:alpha:][:alpha:][:digit:][:digit:][:digit:][:digit:][:digit:][:digit:]

where [:alpha:] = [a-zA-Z] and [:digit:] = [0-9]

If you use a regexp language that allows finite repetitions, that would look like:

[:alpha:]{2}[:digit:]{6}

The correct syntax depends on the particular language you're using, but that is the idea.