Question

I would like replace some the chars of the e-mail addresses with * char.

when a customer make request, I would like to hide some the chars of the e-mail addres like below;

ha~~~~@~~~~ail.com

I would like to do that like that. I would like to show first two chars before @ and last 3 chars after @

but is there any other common way of doing this?

Answer 1

Similar to other responses, but also different. Accepts the .co.uk addresses too.

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

public class Test
{
        public static void Main()
        {
                String regex = @"(.{2}).+@.+(.{2}(?:\..{2,3}){1,2})";
                String replace = "$1*@*$2";
                List<String> tests = new List<String>(new String[]{
                        "[e-mail]",
                        "[e-mail]",
                        "[e-mail]",
                        "[e-mail]",
                        "[e-mail]"
                });
                tests.ForEach(email =>
                {
                        Console.WriteLine(Regex.Replace(email, regex, replace));
                });
        }
}

Results in:

jo*@*le.com
ji*@*ob.com
su*@*co.uk
[e-mail]
[e-mail]

Though I’m not 100% sure what you want to do with names that only have 2 letters on either side (thus the last two results). But that’s my bid. Example