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

[Ben Medina]

Thanks for the help, David and and Fraser! I have it working.

On Tue, Jan 11, 2011 at 4:33 AM, David Cole <david.cole at kitware.com> wrote:
> Thanks, Fraser. Of course...
>
> If you need to escape a backslash such that the regular expression itself
> contains a backslash at a certain point, then you need to double it up. For
> example to match the backslash character itself, you need to use "[\\]", but
> to encode other escape chars directly that CMake knows about, you only need
> one. (Just as you only need one to put the real "\n" character into the
> string in the first place.
>
> This code shows that "Matches2" contains your expected results:
>
>
> cmake_minimum_required(VERSION 2.8)
>
> set(contents "Hello\nWorld!")
> message("contents='${contents}'")
>
> string(REGEX MATCHALL "Hello[\\r\\n\\t ]*World!" matches ${contents})
> message("Matches1:")
> foreach(match ${matches})
>   message("match='${match}'")
> endforeach()
>
> string(REGEX MATCHALL "Hello[\r\n\t ]*World!" matches ${contents})
> message("Matches2:")
> foreach(match ${matches})
>   message("match='${match}'")
> endforeach()
>
>
>
> On Mon, Jan 10, 2011 at 5:38 PM, Fraser Hutchison
> <fraser.hutchison at googlemail.com> wrote:
>>
>> I think if you remove the double "\\" it should work, i.e. use:
>>
>> string (REGEX MATCHALL "TEST_?F?\\([A-Za-z_0-9]+,[\r\n\t\\\\]*[A-Za-z_0-9
>> ]+\\)" found_tests ${contents})
>>
>> Cheers,
>>
>> Fraser.
>>
>>
>>
>>
>> On 1/10/2011 5:04 PM, Ben Medina wrote:
>>
>> It doesn't seem to work:
>>
>> cmake_minimum_required (VERSION 2.8)
>>
>> set (contents "Hello\nWorld!")
>> message ("${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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