Question

I have this string of proxy addresses, they are separated by an space, however x400 and x500 handles spaces into their addresses. What’s the best approach to split it.

e.g.

smtp:[e-mail] smtp:[e-mail] smtp:[e-mail] X400:C=us;A= ;P=mygot;O=Exchange;S=John;G=Gleen; SMTP:[e-mail] 

Expected result:

smtp:[e-mail]
smtp:[e-mail]
smtp:[e-mail]
X400:C=us;A= ;P=mygot;O=Exchange;S=John;G=Gleen;
SMTP:[e-mail]

thanks,

EDIT,

        string mylist = "smtp:[e-mail] smtp:[e-mail] smtp:[e-mail] X400:C=us;A= ;P=mygot;O=Exchange;S=John;G=Gleen; SMTP:[e-mail] X500:/o=Example/ou=USA/cn=Recipients of  /cn=juser smtp:myaddress";

        string[] results = Regex.Split(mylist, @" +(?=\w+:)");
        foreach (string part in results)
        {
            Console.WriteLine(part);
        }

Result

smtp:[e-mail]
smtp:[e-mail]
smtp:[e-mail]
X400:C=us;A= ;P=mygot;O=Exchange;S=John;G=Gleen;
SMTP:[e-mail]
X500:/o=Example/ou=USA/cn=Recipients of  /cn=juser
smtp:myaddress

Answer 1

Here is a Regex that should match the spaces before protocols. Try plugging it into Regex.Split like so:

string[] results = Regex.Split(input, @" +(?=\w+:)");