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

Xufeng Liu <Xufeng_Liu@jabil.com> Mon, 28 August 2017 12:59 UTC

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From: Xufeng Liu <Xufeng_Liu@jabil.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
CC: Per Hedeland <per@tail-f.com>, Ladislav Lhotka <lhotka@nic.cz>, "'netmod@ietf.org'" <netmod@ietf.org>
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Date: Mon, 28 Aug 2017 12:58:59 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/p_jQ0tN2DUkitO7W2yjfjQfmVxw>
Subject: Re: [netmod] Potential additions to rfc6087bis: RegEx guidelines
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> -----Original Message-----
> From: Juergen Schoenwaelder [mailto:j.schoenwaelder@jacobs-university.de]
> Sent: Friday, August 25, 2017 8:53 AM
> To: Xufeng Liu <Xufeng_Liu@jabil.com>
> Cc: Per Hedeland <per@tail-f.com>; Ladislav Lhotka <lhotka@nic.cz>;
> 'netmod@ietf.org' <netmod@ietf.org>
> Subject: Re: [netmod] Potential additions to rfc6087bis: RegEx guidelines
> 
> On Fri, Aug 25, 2017 at 12:40:18PM +0000, Xufeng Liu wrote:
> >
> > > I did not see a proposed change to the standard YANG specification
> > > regarding the regexp flavor, only a proposal that module authors
> > > SHOULD show consideration for implementations that don't comply with
> > > the standard.
> > >
> 
> > [Xufeng] This is the point.
> 
> Perhaps this did not come out properly.
> 
> Anyway, why would I as a YANG author have to replace \d with [0..9] so that
> implementations that can't handle \d are happy? An implementation can easily
> do this substitution itself before passing the pattern to the regex engine it
> prefers to use. (I think this is what libyang is actually doing, I think it uses pcre
> internally.)
> 
> YANG 1.0 and 1.1 are pretty clear which pattern syntax they use.
> Implementations should try to support that.

[Xufeng] [0..9] is still compliant with the XSD pattern specified by YANG 1.0 and 1.1. Using [0..9] instead of [\d] will make the implementations with native POSIX RegEx easier without the need for a tool to inspect every element of the RegEx pattern.

> 
> /js
> 
> --
> 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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