RE_SYNTAX_POSIX_EXTENDED  183 _regex.h         ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DEBUG)	\
RE_SYNTAX_POSIX_EXTENDED  187 _regex.h         (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS		\
RE_SYNTAX_POSIX_EXTENDED 5501 regex.cpp            RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC;