Count using xslt when looking at sub-strings - templates

Question

I would like to count the number of items that match the following conditions:
/results/errors/error/[#severity='warning']
and
test="not(string-length(substring-before(/results/errors/error/location/#file,'cow'))=0)"
So, while my first condition can easily be counted by using the built in count function
count(//results/errors/error[#severity='warning'])
I do not know how to use the count function for the second condition, as it is not in Xpath format.
Any help you can provide to me would be greatly appreciated. (My XML is below)
The desired answer would be: 2
Thank you,
Belinda
My xml looks like this:
<results version="2">
<errors>
<error id="redundantAssignment" severity="performance" msg="blah, blah.">
<location file="/farm/user/cow/src/IO/file1.cpp"/>
<location file="/farm/user/horse//src/IO/file5.cpp"/>
</error>
<error id="redundantAssignment" severity="warning" msg="blah, blah.">
<location file="/farm/user/sheep/src/IO/file1.cpp"/>
<location file="/farm/user/cow/src/IO/file2.cpp"/>
</error>
<error id="redundantAssignment" severity="error" msg="blah, blah.">
<location file="/farm/user/horse/src/IO/file1.cpp"/>
<location file="/farm/user/cow//src/IO/file3.cpp"/>
</error>
<error id="redundantAssignment" severity="warning" msg="blah, blah.">
<location file="/farm/user/sheep/src/IO/file1.cpp"/>
<location file="/farm/user/cow/src/IO/file3.cpp"/>
</error>
<error id="redundantAssignment" severity="warning" msg="blah, blah.">
<location file="/farm/user/sheep/src/IO/file1.cpp"/>
<location file="/farm/user/horse/src/IO/file3.cpp"/>
</error>
<error id="redundantAssignment" severity="style" msg="blah, blah.">
<location file="/farm/user/sheep/src/IO/file1.cpp"/>
<location file="/farm/user/horse/src/IO/file4.cpp"/>
</error>
<error id="redundantAssignment" severity="style" msg="blah, blah.">
<location file="/farm/user/sheep/src/IO/file1.cpp"/>
<location file="/farm/user/horse/src/IO/file2.cpp"/>
</error>
</errors>
</results>

Answer 1

You should be able to combine both into a single count() by adding the second test to the first predicate:
count(/results/errors/error[#severity='warning' and location[not(string-length(substring-before(#file,'cow'))=0)]])
Using your sample XML input, this produces 2.
Simplification using contains() suggested by Tim C...
count(/results/errors/error[#severity='warning' and location[contains(#file,'cow')]])