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Re: [netmod] Potential additions to rfc6087bis: RegEx guidelines

Andy Bierman <andy@yumaworks.com> Sat, 02 September 2017 16:46 UTC

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From: Andy Bierman <andy@yumaworks.com>
Date: Sat, 02 Sep 2017 09:46:38 -0700
Message-ID: <CABCOCHTC2MhBu0Zu44Z=f+J04HiENjQR+J0Sxy-arjcDmBHb_A@mail.gmail.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, "Acee Lindem (acee)" <acee@cisco.com>, "Robert Wilton -X (rwilton - ENSOFT LIMITED at Cisco)" <rwilton@cisco.com>, "netmod@ietf.org" <netmod@ietf.org>
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Subject: Re: [netmod] Potential additions to rfc6087bis: RegEx guidelines
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On Sat, Sep 2, 2017 at 4:28 AM, Juergen Schoenwaelder <
j.schoenwaelder@jacobs-university.de> wrote:

> On Sat, Sep 02, 2017 at 10:39:57AM +0000, Acee Lindem (acee) wrote:
> >
> > This is not an effort to change or bifurcate the YANG 1.1. It is simply
> to
> > RECOMMEND a proper subset of XSD pattern that is more portable.
> >
>
> If you implement YANG as it is defined, pattern are portable. Given
> this, I do not understand the notion of 'more portable'.
>
> Anyway, it seems that those who want a more portable subset do not
> even agree on what that subset is. Perhaps people pushing for this
> should go and write an I-D that explains why a 'more portable' subset
> is needed (which problems are we fixing), that defines such a 'more
> portable subset', and which includes the reasoning how the subset has
> been determined.
>
>

I do not agree that the YANG pattern contains a string that is both a POSIX
and XSD regular expression.
The RFC is very clear it contains an XSD expression. Pretending it is both
is a hack that does not even seem
to work 100%, so it is not reliable.

If the community wants to support both XSD and POSIX expressions, then the
proper engineering
solution is to introduce a new statement that is defined to contain a POSIX
expression.
This can be done with a YANG extension now and added to YANG 2.0 later.



> /js
>

Andy


>
> --
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>
>
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