正则表达式从字符串C＃中删除URL

Question

I have the following code and the regular expression I am currently using does not appear to be catching any url I enter in standard format (www.google.com) as when it is displayed in a listbox, the URL is still there. Does anyone know where I'm going wrong?

e1.MessageBody = txtMessage.Text;
                Regex.Replace(e1.MessageBody, @"/((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)/", ""string.Empty);

Answer 1

var msg = "ASD www.google.com EFIG";

msg = Regex.Replace(msg, @"((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)", string.Empty);

C# doesn't use the regex identifiers (the leading/trailing / ) and you had extra quotes " by the string.empty parameter.