[CMake] Escaping end of line anker in regex

[Torsten Robitzki]

Hi,
I’ve stumbled over following issue:

if (NOT ^ MATCHES ^\^ )
    message(FATAL_ERROR "Anker not found!")
  endif()

  if (NOT $<foo MATCHES ^\$<)
    message(FATAL_ERROR "Start of generator expression not found!")
  endif()

If run (with version 3.13), this yields:

  $ cmake -P test.cmake
  CMake Error at test.cmake:7 (message):
    Start of generator expression not found!

If I double escape the regex in the second if (^\\$<), then this works as expected. Any idea, why I have to double escape the $-anker? Is this a bug?

Kind regards,

Torsten
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