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

[Juergen Schoenwaelder <[e-mail]>]

On Fri, Sep 01, 2017 at 10:45:51AM +0100, Robert Wilton wrote:
> Hi Alex,
> 
> 
> On 01/09/2017 00:57, Alex Campbell wrote:
> > 
> > Hi,
> > 
> > 
> > I'd be very wary of adding guidelines that restrict the regex syntax.
> > 
> > 
> > A tool that supports YANG must implement the full regex language anyway
> > (or ignore regexes altogether if they are not relevant to the tool's
> > function).
> > 
> This is true if the tool is designed to work with any arbitrary YANG
> module.  But if a tool only needs to work with a subset of YANG modules
> (e.g. perhaps just IETF, OpenConfig, and Vendor models) then they only need
> to support the subset of the XML RE language that is used by the YANG
> modules that they load.
>

Rob,

you are on the path to create multiple flavours of YANG, an IETF
flavour, an OC flavour, a Vendor XYZ flavour - in my view this can't
be the goal of a standard.

A compliant implementation of YANG 1.0 and YANG 1.1 must handle XSD
pattern.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
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