1 files changed, 54 insertions, 0 deletions
diff --git a/Tests/RunCMake/string/RegexClear.cmake b/Tests/RunCMake/string/RegexClear.cmake
new file mode 100644
index 0000000..d5edaac
--- /dev/null
+++ b/Tests/RunCMake/string/RegexClear.cmake
@@ -0,0 +1,54 @@
+cmake_minimum_required (VERSION 3.0)
+project (RegexClear C)
+
+function (output_results msg)
+  message("results from: ${msg}")
+  message("CMAKE_MATCH_0: -->${CMAKE_MATCH_0}<--")
+  message("CMAKE_MATCH_1: -->${CMAKE_MATCH_1}<--")
+  message("CMAKE_MATCH_2: -->${CMAKE_MATCH_2}<--")
+  message("CMAKE_MATCH_COUNT: -->${CMAKE_MATCH_COUNT}<--")
+endfunction ()
+
+function (check_for_success msg)
+  if (CMAKE_MATCH_1 STREQUAL "0" AND
+      CMAKE_MATCH_2 STREQUAL "1")
+    message("Matched string properly")
+  else ()
+    message("Failed to match properly")
+  endif ()
+  output_results("${msg}")
+endfunction ()
+
+function (check_for_failure msg)
+  if (CMAKE_MATCH_1 STREQUAL "" AND
+      CMAKE_MATCH_2 STREQUAL "")
+    message("Matched nothing properly")
+  else ()
+    message("Found a match where there should be none")
+  endif ()
+  output_results("${msg}")
+endfunction ()
+
+macro (do_regex_success msg)
+  string(REGEX MATCH "(0)(1)" output "01")
+  check_for_success("${msg}")
+endmacro ()
+
+macro (do_regex_failure msg)
+  string(REGEX MATCH "(0)(1)" output "12")
+  check_for_failure("${msg}")
+endmacro ()
+
+do_regex_success("setting up initial state")
+
+list(INSERT CMAKE_MODULE_PATH 0
+  "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+find_package(dummy) # Ensure cmMakefile::PushScope/PopScope work.
+
+check_for_failure("checking after find_package")
+do_regex_failure("clearing out results with a failing match")
+do_regex_success("making a successful match before add_subdirectory")
+
+add_subdirectory(subdir)
+
+check_for_success("ensuring the subdirectory did not interfere with the parent") # Ensure that the subdir didn't mess with this scope.