Defined in 3 files as a macro:

• contrib/llvm-project/llvm/lib/Support/regex_impl.h, line 63 (as a macro)
• contrib/nvi/regex/regex.h, line 69 (as a macro)
• include/regex.h, line 73 (as a macro)

Referenced in 3 files:

• contrib/llvm-project/llvm/lib/Support/regcomp.c, line 303
• contrib/nvi/regex/regcomp.c, line 190
• lib/libc/regex/regcomp.c, line 224