mask question

[tonybrooks]

Hi,

If I understand it correctly, mask "?d?d?d" will generate all 3 digit numbers from 000 - 999; But what if I just want to generate numbers from 200 - 399, i.e., the 1st digit is either 2 or 3?

I am thinking that the mask should be [23]?d?d, am I correct? If not, what's the right mask?

Thanks for your time!