Subject: RE: [xsl] lookaheads in XSLT2 regexes From: Liam R E Quin <liam@xxxxxx> Date: Thu, 04 Mar 2010 00:59:44 -0500 |
On Wed, 2010-03-03 at 21:27 +0000, Michael Kay wrote: > > On the subject of \b I'll note we do have \W and \w > > So we do, I overlooked that. And we define it a little differently from > Perl: > > [#x0000-#x10FFFF]-[\p{P}\p{Z}\p{C}] > > So for example "+" is regarded as part of a word, while "-" isn't. Which > strikes me as totally useless, to be honest. I agree. We could fix that for XPath 2.1 I think. I'm not sure what the most useful fix would be, I admit. The Perl definition of "alphanumeric" plus "_" would probably work for \w, if one took alphnumeric to mean Letters|Numbers, \p{L}|\p{N}, and is coincidentally closer to what you get in Perl if you do use locale; and your locale is (say) en_UK.UTF8, as it's then the same as the POSIX fragment [[:alpha:][:digit:]_] There are lots of things that could be added to regular expressions; but \b is hard to emulate, useful, and also we seem to have a rather odd \w. If \w is there, I think \b was omitted by mistake. Or that \w was included by mistake! Liam -- Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/ Pictures from old books: http://fromoldbooks.org/ Ankh: irc.sorcery.net irc.gnome.org www.advogato.org
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