[CMake] Regex help: multi-line matching and matching backslashes

[Ben Medina]

It doesn't seem to work:

cmake_minimum_required (VERSION 2.8)

set (contents "Hello\nWorld!")
message ("${contents}")
string (REGEX MATCHALL "Hello[\\r\\n\\t ]*World!" matches ${contents})

message ("Matches:")
foreach (match ${matches})
    message ("${match}")
endforeach ()

This produces no matches. If you replace "\n" with " " in the contents
string, then you get a match.

Thanks,
Ben

On Fri, Jan 7, 2011 at 12:18 PM, David Cole <david.cole at kitware.com> wrote:
> It should work.
>
> But I'm pretty sure we don't recognize "\s" for white space. Try "[
> \\t\\n\\r]" instead of \\s.
>
> But..... watch out for white space after "(" and before ")" too. You might
> miss some lines if they have spaces there.
>
>
> On Fri, Jan 7, 2011 at 2:55 PM, Ben Medina <ben.medina at gmail.com> wrote:
>>
>> I need to parse a C++ file for Google Test macros. (I'm aware the
>> GTEST_ADD_TESTS provided by FindGtest.cmake, but I need the test list
>> for my own purposes). I had been using a regex similar to the one in
>> GTEST_ADD_TESTS to match tests:
>>
>> string (REGEX MATCHALL "TEST_?F?\\([A-Za-z_0-9 ,]+)\\)" found_tests
>> ${contents})
>>
>> But this doesn't work when the test is split onto two lines, like this:
>>
>> TEST(SampleTest,\
>>     MultilineTest)
>>
>> So, I've been trying to build a regex that will match tests split onto
>> multiple lines. This should work:
>>
>> string (REGEX MATCHALL "TEST_?F?\\([A-Za-z_0-9
>> ]+,[\\s\\\\]*[A-Za-z_0-9 ]+\\)" found_tests ${contents})
>>
>> After the comma, the regex should greedily match all whitespace
>> (including newlines) via the "\\s" and backslashes via the "\\\\"
>> (Note that all special characters are escaped). This works in other
>> regex engines, but fails in CMake.
>>
>> Is this possible in CMake, or do I need to use another tool?
>>
>> Here is my test file (named tests.cpp):
>>
>> TEST(SampleTest, SingleLineTest)
>> TEST(SampleTest,\
>>     MultilineTest)
>> TEST_F(SampleTest, SingleLineFixtureTest)
>> TEST_F(SampleTest,\
>>     MultilineFixtureTest)
>>
>> And my CMakeLists.txt:
>>
>> cmake_minimum_required (VERSION 2.8)
>>
>> file (READ "tests.cpp" contents)
>> string (REGEX MATCHALL "TEST_?F?\\([A-Za-z_0-9
>> ]+,[\\s\\\\]*[A-Za-z_0-9 ]+\\)" found_tests ${contents})
>> message ("Found tests:")
>> foreach (test ${found_tests})
>>    message ("${test}")
>> endforeach ()
>>
>> Thanks,
>> Ben
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>