Regular Expression Validation

Hi vivekpazhani,
Here you go:
^(upto|)[0-9]{1,2}%$

^ - start of the string
$ - end of the string
(upto|) - either "upto" or nothing
[0-9]{1,2} - a digit or two digits ({1,2} means between 1 and 2 times)
% - match the char %


You can use it in C# like this:

string input = MyTexBox.Text;
// Here we call Regex.Match.
Match match = Regex.Match(input, @"^(upto|)[0-9]{1,2}%$",
    RegexOptions.IgnoreCase);

// Here we check the Match instance.
if (match.Success)
{
   // do stuff
}
else
{
   // do some other stuff
}

Cheers,
Edo

Your needed match pattern could be (pseudo code)
1) start with optional spaces
2) followed by optional text "upto" followed by one or more spaces
3) followed by either
3.1) one of the digits 0-9
3.2) or one of the digits 1-9 followed by one of the digits 0-9
4) followed by optional spaces an followed by "%"
5) end on optional spaces

Translated into C#:

//1111222222222222333333333334444445555
@"^\s*(?:upto\s+)?[1-9]?[0-9]\s*[%]\s*$"

Use that in a Regex C# class[^].
Cheers
Andi