Question

How to extract only special characters from a string in C#

Answer 1

using System;
using System.Text.RegularExpressions;
 
class Program
{
    static String extract_special_characters(String s) {
        int len = s.Length;
 
        var regx = new Regex("[a-zA-Z0-9 ]");
 
        String pecial_characters = "";
        for (int i = 0; i < len; i++) { 
            char ch = s[i]; 
            if (!regx.IsMatch(ch.ToString())) 
                pecial_characters = pecial_characters + ch; 
        } 
        return pecial_characters;
    } 
    static void Main() {
        String s = "c++$vb.net&%java*() php c# <>/python 3.7.3"; 
         
        Console.WriteLine(extract_special_characters(s));
    }
}
 
 
/*
run:
 
++$.&%*()#<>/..
 
*/

 

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