Re: [apps-discuss] Fun with URLs and regex

[Bjoern Hoehrmann <[e-mail]>]

* Mark Nottingham wrote:
>I’ve updated my Python script that serves as a translation of ABNF for 
>URIs into regex.

I note that there are a number of automated tools for this; I have not
tried any of them recently though, but perhaps other can suggest one.

>https://gist.github.com/mnot/138549
>
>It now validates the following URI schemes according to their respective 
>specifications:
>  - http
>  - https
>  - file
>  - data
>  - gopher
>  - ws
>  - wss
>  - mailto
>
>I didn’t finish mailto or data, because they allow quoted-string inside 
>of URLs, and that makes my head hurt.

The bigger problem might be that URI scheme grammars typically do not
account for %xx-encoding. It should be fine to write `dAtA:;B%41se64,`,
so you cannot use literals like `;base64` directly, unless you apply
some syntax-preserving pre-processing. RFC 6068 also re-writes the RFC
5322 productions it uses in prose, and considering how complex the RFC
5322 grammar is, it is probably not wise to attempt to do this manually.
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