How to replace all special character into a string using C# [closed]

I would like to replace all special characters in a string with a comma (,).

For Example:

Hello@Hello&Hello(Hello)

the output -

Hello,Hello,Hello,Hello,

(I don't known how to use regexp in C#)

Can i do this work using regexp in C#?

4 Answers

Yes, you can use regular expressions in C#.

Using regular expressions with C#:

using System.Text.RegularExpressions;
string your_String = "Hello@Hello&Hello(Hello)";
string my_String = Regex.Replace(your_String, @"[^0-9a-zA-Z]+", ",");

Assume you want to replace symbols which are not digits or letters (and _ character as @Guffa correctly pointed):

string input = "Hello@Hello&Hello(Hello)";
string result = Regex.Replace(input, @"[^\w\d]", ",");
// Hello,Hello,Hello,Hello,

You can add another symbols which should not be replaced. E.g. if you want white space symbols to stay, then just add \s to pattern: \[^\w\d\s]

You can use a regular expresion to for example replace all non-alphanumeric characters with commas:

s = Regex.Replace(s, "[^0-9A-Za-z]+", ",");

Note: The + after the set will make it replace each group of non-alphanumeric characters with a comma. If you want to replace each character with a comma, just remove the +.

Also, It can be done with LINQ

var str = "Hello@Hello&Hello(Hello)";
var characters = str.Select(c => char.IsLetter(c) ? c : ',')).ToArray();
var output = new string(characters);
Console.WriteLine(output);