I think that the most relevant bits are:
[3] piece ::= atom quantifier?
[9] atom ::= Char | charClass | ( '(' regExp ')' )
[4] quantifier ::= [?*+] | ( '{' quantity '}' )
In https? we have five pieces, of which only the last has a quantifier
So https? means h, t, t, p, optional-s
If you want the '?' to apply to more, then you need parentheses, e.g.,
(https)?.
On Wed, 7 Sept 2022 at 10:29, tom petch <[email protected]> wrote:
> I commented recently on a draft that said that a regex of
> https?
> would match http which I said it would not. The author said that he had
> tested it ok so I turned to XML Schema Part 2 as referenced by RFC7950
> which tells me that
> S? the empty string, and all strings in L(S)
> where L(S) is not explained and my set theory is too rusty to help.
>
> Can anyone confirm for me that I am wrong, and that the Author is right?
>
> Tom Petch
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> https://www.ietf.org/mailman/listinfo/netmod
>
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