ZLEXCOUNT command in redis

ZLEXCOUNT key min max

This command counts the number of members in a sorted set between a given lexicographical range.

When all the elements in a sorted set are inserted with the same score, in order to force lexicographical ordering, this command returns the number of elements in the sorted set at the key with a value between min and max.

RETURN VALUE:

Integer reply, the number of elements in the specified score range.

Syntax:

ZLEXCOUNT key min max

Example 1: When the min and max are valid string

redis:6379> ZADD mykey 2 A 1 C 3 B 4 E 5 D
(integer) 5 
redis:6379> ZLEXCOUNT mykey - +
(integer) 5

Output

5

Example 2: When the min and max are not a valid string

redis:6379> ZADD mykey 2 A 1 C 3 B 4 E 5 D
(integer) 5
redis:6379> ZLEXCOUNT mykey 1 7
(error) min or max not valid string range item
redis:6379> ZLEXCOUNT mykey A Z
(error) min or max not valid string range item

Output

(error) min or max not valid string range item