SET0               25 ext/ereg/regex/regexec.c #define	SET0(v, n)	((v) &= ~((unsigned)1 << (n)))
SET0               51 ext/ereg/regex/regexec.c #undef	SET0
SET0               72 ext/ereg/regex/regexec.c #define	SET0(v, n)	((v)[n] = 0)