[CMake] string replace first occurrence of a period using regex

[Mikael Sundell]

First, thanks for cmake!
In cmake, how can I easily replace the first period "." in a string with a
substitute using regex and string replace?
For example:
  z
  z.1
  z.1.2.5
With replacement ".so", "." becomes ".so" as in:
  z.so
  z.so.1
  z.so.1.2.5
My regex is improving but not fast enough :)
Thanks,
Mikael
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