RE_SYNTAX_POSIX_EXTENDED  491 compat/regex/regcomp.c   reg_syntax_t syntax = ((cflags & REG_EXTENDED) ? RE_SYNTAX_POSIX_EXTENDED
RE_SYNTAX_POSIX_EXTENDED  205 compat/regex/regex.h   ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS		\
RE_SYNTAX_POSIX_EXTENDED  211 compat/regex/regex.h   (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS		\