Check if string contains at least two alpha chars

Question

I need to check if a string has at least two alpha characters, like a1763r or ab1244
I was thinking I would use something like:

myString = "a123B";  
myString.Any(char.IsDigit).Count();

but I'm using .net 2.0 so this method Any() does not exists.

Is there something equivalent?

Answer 1

Don't know about alpha or what not, but you can count how many characters are digits without Linq like so:

string str = "a123B";
int digits = 0;
foreach (char c in str)
    if (char.IsDigit(c))
        digits++;
print(digits); // 3

Answer 2

You can create a simple helper function that loops over your string, taking in a minimum threshold to meet. It returns boolean to match the type of output behavior from .Any()

public bool ContainsMinAlphaCharacters(string input, int threshold)
{
    var count = 0;
    foreach (var character in input)
    {
        if (char.IsDigit(character)) count++;
        if (count >= threshold) 
        {
            return true;
        }
    }

    return false;
}

Answer 3

Use regexpressions

two letters: Regex.IsMatch(myString, "[A-Za-z].*?[A-Za-z]");

two digits: Regex.IsMatch(myString, "\\d.*?\\d");

Answer 4

Not really. You will have to loop through the string and check if each character is a digit to get the count.