Juergen and Alex,
The choice of Posix 1003.2 regular expressions was because of multiple vendors
who supported same and asked for model support:
http://www.juniper.net/documentation/en_US/junos12.3/topics/reference/configuration-statement/syslog-edit-system.html
http://www.rsyslog.com/doc/v8-stable/configuration/filters.html
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/esm/command/esm-cr-book/esm-cr-a1.html#wp1888787448
https://infoproducts.alcatel-lucent.com/html/0_add-h-f/93-0071-10-01/7750_SR_OS_System_Management_Guide/Logcli.html#1030840
Posix 1003.2 regular expressions support Unicode characters using the notation:
\uFFFF or \x{FFFF}.
I will insert a normative reference to POSIX 1003.2 in the next revision of the
draft.
Thanks,
Clyde
On 7/18/17, 1:26 AM, "netmod on behalf of Juergen Schoenwaelder"
<[email protected] on behalf of [email protected]>
wrote:
On Mon, Jul 17, 2017 at 11:20:40PM +0000, Alex Campbell wrote:
> I am considering to implement the data model in this draft. (dependent on
business priorities of course)
> I have reviewed this draft and found the following issues.
>
> * I see pattern-match is specified to use POSIX 1003.2 regular
expressions. This is presumably for compatibility with existing
implementations; however it is inconsistent with most of YANG (which is
specified to use XPath regular expressions) - unless these are the same.
The fact that the schema language uses a different regular expression
language than the data model is by itself not a problem I think. What
is potentially a problem is that RFC 5424 syslog messages are UTF-8
and hence the regular expression language adopted should be able to
match on unicode characters. Does POSIX 1003.2 do that? (There also
needs to be a normative reference to POSIX 1003.2 or whatever is
finally adopted.)
/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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