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Re: [netmod] regular expression flavours (again)

Robert Varga <nite@hq.sk> Fri, 14 June 2019 13:05 UTC

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To: Carsten Bormann <cabo@tzi.org>, "Rob Wilton (rwilton)" <rwilton@cisco.com>
Cc: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, NETMOD WG <netmod@ietf.org>
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From: Robert Varga <nite@hq.sk>
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Subject: Re: [netmod] regular expression flavours (again)
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On 14/06/2019 11:56, Carsten Bormann wrote:
> Now the main deployability problem with W3C XSD regexes is that they added some functionality that is sorely missing in other dialects, such as character class subtraction, so it is more than an hour of work to write a converter from XSD regexes to you favorite flavor.  Maybe we should encourage some open source software in this space…

Having gone through the path of:
- just throw it in java.util.regex.Pattern, with ^$ wrapped
- oh yeah, that does not work for complex patterns
- oh wait, character class references are different
- oh wait, character groups are different
...

I decided to take this exact approach here:
https://git.opendaylight.org/gerrit/73875 . The idea is to contribute
the ANTLR grammar to https://github.com/antlr/grammars-v4/ so that
anybody working with a language supported by ANTLR can get some head start.

This work low priority for me, though, as the current set of hacks work
well enough and a complete solution requires Java 9 anyway -- so anyone
is free to pick it up...

Regards,
Robert

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