- From: Paul J. Lucas <paul@lucasmail.org>
- Date: Sun, 2 Jan 2011 13:21:35 -0800
- To: Michael Kay <mike@saxonica.com>
- Cc: public-qt-comments@w3.org
On Jan 2, 2011, at 11:56 AM, Michael Kay wrote: > On 02/01/2011 17:01, Paul J. Lucas wrote: >> The W3C test K2-MatchesFunc-11: >> >> matches("abcd", "(asd)[\1]") >> >> tests that an XQuery implementation should raise the FORX0002 error for a back reference inside a character class. However, after reading: >> >> * XQuery and XPath Functions and Operators, section 7.6.1 >> * XML Schema Part 2, appendix F >> >> I can't find where any specification explicitly forbids it. Can somebody point me to the section of a specification that does? Thanks. >> > It's stated twice in section 7.6.1 (http://www.w3.org/TR/xpath-functions/#regex-syntax): > > (a) "Back-references are allowed outside a character class expression." > > (b) Note: Within a character class expression, \ followed by a digit is invalid. Some other regular expression languages interpret this as an octal character reference. OK, I was looking at the 2007 version of the spec. I didn't realize there was a Dec 2010 version. - Paul
Received on Sunday, 2 January 2011 21:22:13 UTC