RE_SYNTAX_POSIX_EXTENDED  481 lib/regcomp.c    reg_syntax_t syntax = ((cflags & REG_EXTENDED) ? RE_SYNTAX_POSIX_EXTENDED
RE_SYNTAX_POSIX_EXTENDED  254 lib/regex.h      ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DEBUG)	\
RE_SYNTAX_POSIX_EXTENDED  259 lib/regex.h      (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS		\