Case insensitivity using Xpath and libXML

Justudo has asked for the wisdom of the Perl Monks concerning the following question:

Hi all monks. I'm using libXML and a Xpath fashion of search. Have a sample Xpath search string like.

//userprop[nameprop="Version" and contains(valueprop,"v1.1")]
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Is it possible to add in case insensitive searches like this ?

//userprop[nameprop="Version" and contains(lc(valueprop),lc("v1.1"))]
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Sample data :


<userprop>
  <nameprop>Version</nameprop>
  <valueprop>v1.1</valueprop>
</userprop>
<userprop>
  <nameprop>Version</nameprop>
  <valueprop>V1.1</valueprop>
</userprop>
<userprop>
  <nameprop>Subject</nameprop>
  <valueprop>Not applicable</valueprop>
</userprop>
[download]

Comment on Case insensitivity using Xpath and libXML Select or Download Code

Replies are listed 'Best First'.
Re: Case insensitivity using Xpath and libXML by derby (Abbot) on May 14, 2004 at 12:05 UTC
It looks ugly but translate should work. Try (untested): `//userprop[nameprop="Version" and contains(translate(valueprop, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz"),"v1.1 +")]` [download] I'm not sure why you would want to lc the static string. -derby	[reply] [d/l]
Re: Case insensitivity using Xpath and libXML by dakkar (Hermit) on May 14, 2004 at 13:27 UTC
XSLT does not define any case-mapping functions. `translate` works only if you know which characters you can find in the string (for the same reasons that in Perl `tr{A-Z}{a-z}` will not lowercase a string correctly) You could write an extension function in Perl, register it in libxmls's xpath context, and use it. There should be a test in the XML::LibXML distribution defining extension functions. -- dakkar - Mobilis in mobile Most of my code is tested... Perl is strongly typed, it just has very few types (Dan)	[reply] [d/l]


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