regex plugin fails on windows

[rvjansen]

The regex plugin fails on my windows 11 with

FAILED: lib/plugins/regex/CMakeFiles/_regex.dir/regex.c.obj
C:\ProgramData\chocolatey\bin\gcc.exe -DBUILD_DLL -DPLUGIN_ID=rx_regex -D_regex_EXPORTS -IC:/Users/rvjansen/apps/CREXX/rxpa -D__USE_MINGW_ANSI_STDIO=1 -O3 -DNDEBUG -std=gnu90 -MD -MT lib/plugins/regex/CMakeFiles/_regex.dir/regex.c.obj -MF lib\plugins\regex\CMakeFiles\_regex.dir\regex.c.obj.d -o lib/plugins/regex/CMakeFiles/_regex.dir/regex.c.obj -c C:/Users/rvjansen/apps/CREXX/lib/plugins/regex/regex.c
C:/Users/rvjansen/apps/CREXX/lib/plugins/regex/regex.c:36:10: fatal error: regex.h: No such file or directory
   36 | #include <regex.h>

so not all windows versions have a regex.h ?