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/CMake 3.19

CMAKE_MATCH_COUNT

New in version 3.2.

The number of matches with the last regular expression.

When a regular expression match is used, CMake fills in CMAKE_MATCH_<n> variables with the match contents. The CMAKE_MATCH_COUNT variable holds the number of match expressions when these are filled.

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https://cmake.org/cmake/help/v3.19/variable/CMAKE_MATCH_COUNT.html