NSTRING_LEN      2653 regcomp.c            if (NSTRING_LEN(x) == 0)
NSTRING_LEN      2692 regcomp.c                len = NSTRING_LEN(x);
NSTRING_LEN      2693 regcomp.c                if (len > NSTRING_LEN(y)) len = NSTRING_LEN(y);
NSTRING_LEN      3987 regcomp.c      	  OnigDistance len = NSTRING_LEN(target);