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check alphanumeric characters in string in c#

I have used the following code but it is returning false though it should return true

string check,zipcode;
zipcode="10001 New York, NY";
check=isalphanumeric(zipcode)

public static Boolean isAlphaNumeric(string strToCheck)
{
    Regex rg = new Regex("[^a-zA-Z0-9]");

    //if has non AlpahNumeric char, return false, else return true.
    return rg.IsMatch(strToCheck) == true ? false : true;
}
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by (71.8m points)

Try this one:

public static Boolean isAlphaNumeric(string strToCheck)
{
    Regex rg = new Regex(@"^[a-zA-Z0-9s,]*$");
    return rg.IsMatch(strToCheck);
}

It's more undestandable, if you specify in regex, what your string SHOULD contain, and not what it MUST NOT.

In the example above:

  • ^ - means start of the string
  • []* - could contain any number of characters between brackets
  • a-zA-Z0-9 - any alphanumeric characters
  • s - any space characters (space/tab/etc.)
  • , - commas
  • $ - end of the string

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