IRCUser.this

{
    immutable user = IRCUser("nickname!~ident@address");
    assert((user.nickname == "nickname"), user.nickname);
    assert((user.ident == "~ident"), user.ident);
    assert((user.address == "address"), user.address);
}
{
    immutable user = IRCUser("*!~ident@address");
    assert(!user.nickname.length, user.nickname);
    assert((user.ident == "~ident"), user.ident);
    assert((user.address == "address"), user.address);
}
{
    immutable user = IRCUser("*!*@*");
    assert(!user.nickname.length, user.nickname);
    assert(!user.ident.length, user.ident);
    assert(!user.address.length, user.address);
}