Question

I want to create a TextBox for decimal digits with this pattern:

1/23
12/34
12/323

The integer part is less than 2 and the double part is less than 3.

Answer 1

You probably want a regular expression. Something like:

Regex.IsMatch("133/33", @"^\d{1,2}(\/\d{1,3})?$");

This should return true if the whole part of the number being 1 to 2 digits in length and the decimal part is optional, but if present should be no greater than 3 digits in length.

Or if the decimal part isn’t optional:

Regex.IsMatch("133/33", @"^\d{1,2}\/\d{1,3}$");

(The “133/33” is an example number as a string)