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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.