Question

How to count uppercase, lowercase, special characters, and numeric values using RegEx in C#

Answer 1

using System;
using System.Text.RegularExpressions;

class Program
{
    static (int Uppercase, int Lowercase, int Digits, int Special) CountCharacters(string text)
    {
        int uppercase = Regex.Matches(text, "[A-Z]").Count;
        int lowercase = Regex.Matches(text, "[a-z]").Count;
        int digits    = Regex.Matches(text, "\\d").Count;
        int special   = Regex.Matches(text, "[^A-Za-z0-9]").Count;

        return (uppercase, lowercase, digits, special);
    }

    static void Main()
    {
        string s = "Programming&AI@2026!";

        var result = CountCharacters(s);

        Console.WriteLine("Uppercase: " + result.Uppercase);
        Console.WriteLine("Lowercase: " + result.Lowercase);
        Console.WriteLine("Digits: " + result.Digits);
        Console.WriteLine("Special characters: " + result.Special);
    }
}


/*
run:

Uppercase: 3
Lowercase: 10
Digits: 4
Special characters: 3

*/

 

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