- From: Abel Braaksma <abel.braaksma@xs4all.nl>
- Date: Tue, 9 Feb 2016 21:00:45 +0100
- To: <public-xsl-query@w3.org>
> -----Original Message----- > From: Michael Kay [mailto:mike@saxonica.com] > > On 9 Feb 2016, at 17:42, Abel Braaksma <abel.braaksma@xs4all.nl> wrote: > > > > I think that [()] is invalid, it should be [\(\)], because capturing inside a class > is explicitly disallowed, isn't it? > > > I checked this in XSD. The only characters that need to be escaped in a > character class are "[" and "]", or in some situations "-" and "^". It seems that > parens inside a character class just represent parens to be matched, and > have no syntactic or semantic significance. > > The existing F+O text didn't explicitly say that opening parens within a > character class are not counted. I took this as being obviously an oversight, > and fixed it as part of the tidy-up. > You are right, parens are allowed (I thought I remember tests that actually expected to throw, but I can't find them). I may have been confused with back-references inside classes, which are not allowed. I.e., [(.)] is allowed (matching dot and parens, no capture) [(.)\1] is a regex syntax error > character class are "[" and "]", or in some situations "-" and "^". Yes, and, obviously, "\" itself. Thanks, Abel
Received on Tuesday, 9 February 2016 20:01:26 UTC