diff --git a/Tests/CTestTestMemcheck/CMakeLists.txt b/Tests/CTestTestMemcheck/CMakeLists.txt
index 86d73854b..b5162c9a4 100644
--- a/Tests/CTestTestMemcheck/CMakeLists.txt
+++ b/Tests/CTestTestMemcheck/CMakeLists.txt
@@ -35,14 +35,31 @@ target_link_libraries(memcheck_fail CMakeLib)
 # same filenames.
 add_subdirectory(NoLogDummyChecker)
 
-if (APPLE)
-    # filter out additional messages by Guard Malloc integrated in Xcode
-    set(GUARD_MALLOC_MSG "(ctest\([0-9]+\) malloc: [^\n]*\n)*")
-    set(NORMAL_CTEST_OUTPUT "\n1/1 MemCheck #1: RunCMake \\.+   Passed +[0-9]+\\.[0-9]+ sec\n${GUARD_MALLOC_MSG}\n${GUARD_MALLOC_MSG}100% tests passed, 0 tests failed out of 1\n.*\n-- Processing memory checking output: \n${GUARD_MALLOC_MSG}Memory checking results:\n${GUARD_MALLOC_MSG}")
-else ()
-    set(NORMAL_CTEST_OUTPUT "\n1/1 MemCheck #1: RunCMake \\.+   Passed +[0-9]+\\.[0-9]+ sec\n\n100% tests passed, 0 tests failed out of 1\n.*\n-- Processing memory checking output: \nMemory checking results:\n")
-endif ()
-set(BULLSEYE_MSG "(BullseyeCoverage[^\n]*\n)?")
+if(APPLE)
+  # filter out additional messages by Guard Malloc integrated in Xcode
+  set(guard_malloc_msg "ctest\\([0-9]+\\) malloc: ")
+  set(guard_malloc_lines "(${guard_malloc_msg}[^\n]*\n)*")
+  set(guard_malloc_output "${guard_malloc_msg}|")
+else()
+  set(guard_malloc_msg "")
+  set(guard_malloc_lines "")
+  set(guard_malloc_output "")
+endif()
+
+# When this entire test runs under coverage or memcheck tools
+# they may add output to the end, so match known cases:
+#  - Bullseye adds a "BullseyeCoverage..." line.
+#  - Valgrind memcheck may add extra "==..." lines.
+set(other_tool_output "((${guard_malloc_output}BullseyeCoverage|==)[^\n]*\n)*")
+
+string(REPLACE "\r\n" "\n" ctest_and_tool_outputs "
+1/1 MemCheck #1: RunCMake \\.+   Passed +[0-9]+\\.[0-9]+ sec
+${guard_malloc_lines}
+100% tests passed, 0 tests failed out of 1
+.*
+-- Processing memory checking output:( )
+${guard_malloc_lines}Memory checking results:
+${other_tool_output}")
 
 function(gen_mc_test_internal NAME CHECKER)
     set(SUBTEST_NAME "${NAME}")
@@ -146,7 +163,7 @@ set_tests_properties(CTestTestMemcheckDummyValgrind
                      CTestTestMemcheckDummyValgrindPrePost
                      CTestTestMemcheckDummyPurify
     PROPERTIES
-    PASS_REGULAR_EXPRESSION "${NORMAL_CTEST_OUTPUT}${BULLSEYE_MSG}$")
+    PASS_REGULAR_EXPRESSION "${ctest_and_tool_outputs}$")
 
 foreach (_pp Pre Post)
     string(TOLOWER ${_pp} _pp_lower)
@@ -157,7 +174,7 @@ endforeach ()
 
 set_tests_properties(CTestTestMemcheckDummyValgrindIgnoreMemcheck
     PROPERTIES
-    PASS_REGULAR_EXPRESSION "\n2/2 Test #2: RunCMakeAgain .*${NORMAL_CTEST_OUTPUT}${BULLSEYE_MSG}$")
+    PASS_REGULAR_EXPRESSION "\n2/2 Test #2: RunCMakeAgain .*${ctest_and_tool_outputs}$")
 
 set_tests_properties(CTestTestMemcheckDummyBC PROPERTIES
     PASS_REGULAR_EXPRESSION "\n1/1 MemCheck #1: RunCMake \\.+   Passed +[0-9]+.[0-9]+ sec\n\n100% tests passed, 0 tests failed out of 1\n(.*\n)?Error parsing XML in stream at line 1: no element found\n")