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Add warning in docs on performance when using EXSLT regexp functions

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Paul Tremberth 2014-01-15 12:52:10 +01:00
parent a3eba68aca
commit 88c8a523a7
1 changed files with 4 additions and 1 deletions
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docs/topics/selectors.rst
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@ -280,7 +280,10 @@ Example selecting links in list item with a "class" attribute ending with a digi
[u'link1.html', u'link2.html', u'link4.html', u'link5.html'] [u'link1.html', u'link2.html', u'link4.html', u'link5.html']
>>> >>>
.. warning:: C library ``libxslt`` doesn't natively support EXSLT regular
expressions so `lxml`_'s implementation uses hooks to Python's ``re`` module.
Thus, using regexp functions in your XPath expressions may add a small
performance penalty.
Set operations Set operations
~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~