Return the user
<include/boost/url/url_view_base.hpp>
template<class StringToken = string_token::return_string>
StringToken::result_type
user(StringToken&& token) const;
If present, this function returns a string representing the user (which may be empty). Otherwise it returns an empty string. Any percent-escapes in the string are decoded first.
assert( url_view( "http://jane%2Ddoe:pass@example.com" ).user() == "jane-doe" );
userinfo = user [ ":" [ password ] ]
user = *( unreserved / pct-encoded / sub-delims )
password = *( unreserved / pct-encoded / sub-delims / ":" )
has_password , has_userinfo , encoded_password , encoded_user , encoded_userinfo , password , userinfo .