Make grep call in seq fallback implementation Posix compliant

darcs-hash:20060731165626-ac50b-5560aebc877f49f4942b2c730273d8c2424bec24.gz

seq.in

@@ -39,7 +39,7 @@ switch (count $argv)
 end
 
 for i in $from $step $to
-	if not echo $i | grep '^-\?[0-9]*\(\|.[0-9]\+\)$' >/dev/null
+	if not echo $i | grep -E ^-?[0-9]*([0-9]*|\.[0-9]+)$' >/dev/null
 		printf (_ "%s: '%s' is not a number\n") seq $i
 		exit 1
 	end