is_alnum         3921 ext/nkf/nkf-utf8/nkf.c 		} else if (!is_alnum(prev0)) {
is_alnum         4401 ext/nkf/nkf-utf8/nkf.c 	if (!( (c=='+'||c=='/'|| c=='=' || c=='?' || is_alnum(c))))
is_alnum         4483 ext/nkf/nkf-utf8/nkf.c 	    c1=='-'||c1=='_'||is_alnum(c1)) continue;