ISSET              27 ext/ereg/regex/regexec.c #define	ISSET(v, n)	((v) & ((unsigned)1 << (n)))
ISSET              53 ext/ereg/regex/regexec.c #undef	ISSET
ISSET              74 ext/ereg/regex/regexec.c #define	ISSET(v, n)	((v)[n])