On 2011-05-19 23:36, Michael Kay wrote:
On 19/05/2011 18:45, Julian Reschke wrote:
Hi there,
I've got two regexp-related questions.
1) Is it correct that XSLT/XPath2's regular expressions do not support
non-capturing groups (as shown in
<http://www.exampledepot.com/egs/java.util.regex/NoGroup.html>)?
Yes. This is being added in 3.0.
2) With respect to analyze-string, and the captured regex-groups:
I'm using a regex like
([A-Z]+) = ([A-Z]+) ( ; ([A-Z]+) = ([A-Z]+) )*
for matching things like
a=b;c=d;e=f
Why not use the regex
([A-Z]+) = ([A-Z]+)
and rely on xsl:matching-substring being called multiple times?
My bad. I simplified the example too much; the first segment has a
(slightly) different syntax.
Alternatively, first use tokenize() to split on the semicolons, and then
put each token through xsl:analyze-string.
See above; the separator character can occur in quoted values; I
simplified too much.
Personally, I find long regexes very difficult to get right, and try to
split the task up into small pieces that I can understand and debug.
Indeed.
I'm now assembling them piece by piece from smaller sub-expressions,
each of which matching a part of the grammar I'm trying to parse.
Thanks for the feedback, Julian
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