3.1 Limitiations on usernames and hostnames - syntatic specification of the userpart

[AaronNGray]

I cannot find any reference, description, or meaning of the usage of the 0* multiplicity operator in the document or in RFC7565 or RFC 5234.

userpart     = unreserved / sub-delims
               0*( unreserved / pct-encoded / sub-delims )

[trwnh]

The ABNF was taken directly from RFC 7565 Section 7 "IANA Considerations" > "URI Scheme Syntax"

The a*b syntax is "variable repetition" as defined in RFC 5234 Section 3.6: https://www.rfc-editor.org/rfc/rfc5234.html#section-3.6

It means "at least 0". Granted, this is already the default value for a, so I assume the authors of RFC 7565 wanted to be even more explicit for some reason.

[AaronNGray]

Can we specify this in the document as its not immediately obvious.

Also can we add a Regular expression defintion for usernames too please ?

[evanp]

Why does this issue require synchronous discussion by the whole CG?