using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @/
^((([A-Za-z][A-Za-z0-9]*[\.\_]*[A-Za-z0-9]+){0,30}@[a-z]{3,15}\.[a-z]{2,5})|(([A-Za-z][A-Za-z0-9]*[._]*[A-Za-z0-9]+){0,30}@[a-z]{3,15}\.[a-z]{2}\.[a-z]{2,5}))$
/;
string substitution = @"";
string input = @"lkffdsl@gmail.co.co";
Regex regex = new Regex(pattern);
string result = regex.Replace(input, substitution, 1);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx