- 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