perl XML::LibXML not selector

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In the following HTML snippet:

<div><p class="a b c"></p> <p class="a c"></p> <p class="d"></p> </div>

I want to select only the second p element (with the a class and without the b class) using not selector as follows:

p.a:not(.b)

The xpath counterpart is

.//p[contains(concat(' ', normalize-space(@class), ' '), ' a ')][not(self::*[contains(concat(' ', normalize-space(@class), ' '), ' b ')])].

But when I use that xpath expression, it cannot locate the element.

Is there something else that I can use to achieve the effect of not selector?

Update: It seems I have made a mistake, because p.a:not(.b) and its xpath counterpart do seem to work perfectly for XML::LibXML.

It didn't work because I got one of the if condition wrong…

xml-libxml selector perl xpath css
1 Answers

To get what you want just use this XPath:

//p[@class[not(contains(.,"b"))]]

In other words : select a p element with a @class attribute that doesn't contain a "b".

EDIT : To be more specific (class has to contain a but not b) :

//p[@class[contains(.,"a")] and not(@class[contains(.,"b")])]
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