[Issue-67] [Action-385] Work on regex for validating regex subset proposal

Hi all,


I made some headway on action 385. Just to summarise:

Yves raised an Issue
(https://www.w3.org/International/multilingualweb/lt/track/issues/67) on
Allowed Characters
allowedchars) stating that using the XML Schema Character Class regular
expression syntax reduces interoperability


Shaun did a research for Action-385
(https://www.w3.org/International/multilingualweb/lt/track/actions/385) and
came up with a small sub-set of common regular expressions supported by most
of the engines
html) which is more or less the one Yves suggested before:

1.	character classes [abc]  [a-zA-Z_\-]
2.	ranges [a-c]
3.	negations [^abc]
4.	"^" and "]" must never appear unless backslash-escaped
5.	"-" may be backslash-escaped
6.	escape sequences "\n", "\r", "\t", "\d", and "\D"
7.	literal "\" is escaped as "\\"


Subsequently he developed a regex which Felix corrected, that is:




but it doesn’t seem to work.


Since I don’t quite understand the regex structure chosen by Shaun, I took
the liberty of adapting it a little bit, I think that now is simpler and It
supports the sub-sets, character classes, ranges, negations, etc… plus
greedy and lazy operators (which I can drop if they’re no needed, but I
believe that most of engines use them and are usually helpful) but I’m still
working on it because it needs more work, for instance points 4, 5 and 7
work but without limitations.

So just like Shaun did:

Here is the proposed regular expression escaped with XML numeric character
entities, as if it were put into an XML document:





And here is a regular expression that matches a subset of our subset,
limited to Plane 1, with the \u escape (I tested it with PHP and JavaScript
and It works):



Please, implementers and whoever that is interested, give feedback if
necessary so I can move forward and evolve the regex. 




Pablo Nieto Caride

Dpto. Técnico/I+D+i

Linguaserve Internacionalización de Servicios, S.A.

Tel.: +34 91 761 64 60 ext. 0422
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Received on Thursday, 4 April 2013 15:12:53 UTC