String containing digit or Alphabet

[t4ure4n]

I have a variable string input How do i detect if variable has digit in it or an alphabet.

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[Lost User]

t4urean wrote:

How do i detect if variable has digit in it or an alphabet.

In terms of an exclusive or? To check, if the string is a number: int i = int.TryParse(input) If it's just one digit: int i = int.TryParse(input) and then i =< 9 && i >= 0 If it contains one or more alphabets: bool b = Regex.IsMatch(input, "[a-zA-Z]") regards

[Luc Pattyn]

Hi, you can walk the individual characters of the string:

for (int i=0; i

or equivalently (unless you want to change c, wouldnt work here):

foreach (char c in input) {
... do something with c
}

and you can use one of many many methods available in String class,
such as IndexOf() and Contains()

May I suggest you at least read the MSDN documentation on String class;
or better yet work your way through a introductory C# book.

:)

Luc Pattyn

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[Christian Graus]

You can use regex, or iterate over the chars and use things like char.IsDigit.

Christian Graus - Microsoft MVP - C++ "I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )