iswalnum
int iswalnum(wint_t);
if (iswalnum(c)
} else if (!iswalnum(c) && c != '_')
while (*line && (iswalnum(*line) || *line=='-')) ++line;
if (!dflag || iswalnum(ch))
if (dflag && !iswalnum(ch2)) {
if (iswalnum(c) || iswblank(c)) {