Question

I have a string that needs to be the following format: XX999900.
XX has to be only character no decimal followed by 6 digits.

So I thought of using regex in the following way:

string sPattern = @"^\\[A-z]{2}\\d{6}$";
indexNumber = "ab9999.00";
if (Regex.IsMatch(indexNumber, sPattern)
{
     // do whatever
}

It fails.
Can somebody tell me what is wrong?

Answer 1

I don’t believe [A-z] is a valid character class. You certainly do not need \\ when using @.

Try this:

@"^[a-zA-Z]{2}\d{6}$"

If you need the format to have 4 numerals followed by a . then two more numerals, try this:

@"^[a-zA-Z]{2}\d{4}\.\d{2}$"

(Note that for .NET, \d will match numerals in any script, so you may want to replace it with [0-9] if you want to only match those)