How to Get a Substring in Redis

by

If we have a key that holds a string value, we can use the GETRANGE command to get a substring from that value.

Redis also has a SUBSTR command that does the same thing, but that was deprecated in Redis 2.0.0, in favour of the GETRANGE command.

Example

Suppose we get the full value from the following key:

GET fruit

Result:

"Mangosteen"

We can use GETRANGE to get a substring from that string:

GETRANGE fruit 1 4

Result:

"ango"

The count starts at 0 and so 1 returns the second character. We specified 4 for the end of the substring.

Here’s another example using the same key:

GETRANGE fruit 3 6

Result:

"gost"

Negative Offsets

We can use negative offsets if required.

The negative offset works backwards from the end of the string:

GETRANGE fruit -3 -1

Result:

"een"