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+CMAKE_MATCH_<n>
+---------------
+
+Capture group ``<n>`` matched by the last regular expression, for groups
+0 through 9. Group 0 is the entire match. Groups 1 through 9 are the
+subexpressions captured by ``()`` syntax.
+
+When a regular expression match is used, CMake fills in ``CMAKE_MATCH_<n>``
+variables with the match contents. The :variable:`CMAKE_MATCH_COUNT`
+variable holds the number of match expressions when these are filled.