I have used regex's in the past to check a minimum and maximum number of digits, usually using base10 integers - check between 0 and 99 for example.
One thing I'd like to be able to do is check that a value is between two limits, without capturing and subsequent processing (for reasons beyond the scope of this discussion). Is there any regex construct that will check that the value is between two other values? For example, check that it is between 3010 and 4123, inclusively?