using a variable within a regexp pattern in XQuery

[Michael Kay]

It's very unhelpful to report that something "doesn't work" without saying
how it failed. And if you expected the expression to do something useful,
it's useful to say what you expected it to do: you can't expect us to guess
the intention behind incorrect code.
 
If $q is a variable containing part of a regular expression, then you can
include it in a regex using the concat function:
 
matches(., concat('(', $q, ')*')
 
Regards,

Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay 


  _____  

From: http://x-query.com/mailman/listinfo/talk [mailto:http://x-query.com/mailman/listinfo/talk] On Behalf
Of Manuel Souto Pico
Sent: 01 October 2009 19:53
To: http://x-query.com/mailman/listinfo/talk
Subject:  using a variable within a regexp pattern in XQuery


Hi, 

I'm a bit stuck trying to run a regexp pattern in a XQuery search file.

(1) where $record/langSet[@xml:lang="en"]/tig/term[matches(., $q)]
works
(2) where $record/langSet[@xml:lang="en"]/tig/term[matches(., "$q")]
doesn't work
(3) where $record/langSet[@xml:lang="en"]/tig/term[matches(., "^$q.*$")]
doesn't work
(4) where $record/langSet[@xml:lang="en"]/tig/term[matches(., "^bu.+$")]
works!

Any ideas about how I can get to use regular expressions in this query? 

(4) retrieves 'bufer', 'bug' and 'bus'. If $q is 'bu', (1) retrieves as well
'attribute', 'contrast button', etc.

Thanks a lot! 

Cheers, Manuel


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