Regular Expression with specific required numbers on both sides of decimal point

Question

I am trying to figure out a regular expression for an asp.net RequiredFieldValidator that validates decimal values from 1.001 to 99.9999.

This means every value greater than or equal to 1.001 and less than or equal to 99.9999.

The closest I have managed is:

(?=\d+(?:\.\d+)?$)(?![0\.]+$).{1,7}$

This still allows 0.1 and 1.0001, how do I prevent these values?

Answer 1

You can use negative lookaheads for that task:

^0*(?!1(?:\.0+)?$)(?!1\.000)(?!99\.9999.*[1-9])[1-9][0-9]?(?:\.[0-9]+)?$

Demo

Answer 2

I don't know asp.net, but maybe you could use something like this?

[1-9][0-9]?\.[0-9]{2}[1-9][0-9]?

However, maybe converting this to float and checking its inside the interval would do the trick, without the use of regexp...