c# - Appropriate way to replace a string? -

my input abc@xyz.com

i want replace xyz.com mnop.com

so final result abc@mnop.com

the present way

var input = "abc@xyz.com"; var output = input.split('@')[0] + "@mnop.com"; 

what appropriate way?any regular expression?

replace function sample (with correct exception handle)

/// <summary> /// replace email domain /// </summary> /// <param name="email"> email </param> /// <param name="newdomain"> new domain </param> /// <returns></returns> private string replacemaildomain(string email, string newdomain) {     if (email == null) throw new argumentnullexception("email");      int pos = email.indexof('@');     if (pos < 0)     {         throw new argumentexception("invalid email", "email");     }     else     {         return email.substring(0, pos + 1) + newdomain;     } } 

usage:

string email = replacemaildomain("abc@xyz.com", "mnop.com");