Defined in 5 files as a macro:
- contrib/libarchive/tar/subst.c, line 42 (as a macro)
- contrib/llvm-project/llvm/lib/Support/regex_impl.h, line 56 (as a macro)
- contrib/nvi/regex/regex.h, line 62 (as a macro)
- include/regex.h, line 66 (as a macro)
- tools/build/cross-build/include/linux/regex.h, line 41 (as a macro)