Index: lib/Support/regcomp.c
===================================================================
--- lib/Support/regcomp.c
+++ lib/Support/regcomp.c
@@ -876,7 +876,7 @@
 {
 	char *sp = p->next;
 	struct cname *cp;
-	int len;
+	size_t len;
 
 	while (MORE() && !SEETWO(endc, ']'))
 		NEXT();
@@ -886,7 +886,7 @@
 	}
 	len = p->next - sp;
 	for (cp = cnames; cp->name != NULL; cp++)
-		if (strncmp(cp->name, sp, len) == 0 && cp->name[len] == '\0')
+		if (strncmp(cp->name, sp, len) == 0 && strlen(cp->name) == len)
 			return(cp->code);	/* known name */
 	if (len == 1)
 		return(*sp);	/* single character */