# PASS_REGULAR_EXPRESSION

The test output (stdout or stderr) must match this regular expression for the test to pass. The process exit code is ignored. Tests that exceed the timeout specified by `TIMEOUT` still fail regardless of `PASS_REGULAR_EXPRESSION`. System-level test failures including segmentation faults, signal abort, or heap errors may fail the test even if `PASS_REGULAR_EXPRESSION` is matched.

Example:

    add_test(NAME mytest COMMAND ${CMAKE_COMMAND} -E echo "Passed this test")

    set_property(TEST mytest PROPERTY
      PASS_REGULAR_EXPRESSION "pass;Passed"
    )

`PASS_REGULAR_EXPRESSION` expects a list of regular expressions.

To run a test that may have a system-level failure, but still pass if `PASS_REGULAR_EXPRESSION` matches, use a CMake command to wrap the executable run. Note that this will prevent automatic handling of the `CROSSCOMPILING_EMULATOR` and `TEST_LAUNCHER` target property.

    add_executable(main main.c)

    add_test(NAME sigabrt COMMAND ${CMAKE_COMMAND} -E env $<TARGET_FILE:main>)

    set_property(TEST sigabrt PROPERTY PROPERTY_REGULAR_EXPRESSION "pass;Passed")

    #include <signal.h>
    #include <stdio.h>

    int main(void){
        fprintf(stdout, "Passed\n");
        fflush(stdout);  /* ensure the output buffer is seen */
        raise(SIGABRT);
        return 0;
    }

See also the `FAIL_REGULAR_EXPRESSION` and `SKIP_REGULAR_EXPRESSION` test properties.