SubstrCommand: Contents
SUBSTR _key_ _start_ _end_
Return value
Examples

# SubstrCommand

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# SUBSTR _key_ _start_ _end_

Time complexity: O(start+n) (with start being the start index and n the total length of the requested range). Note that the lookup part of this command is O(1) so for small strings this is actually an O(1) command.

> Return a subset of the string from offset start to offset end(both offsets are inclusive).Negative offsets can be used in order to provide an offset starting fromthe end of the string. So -1 means the last char, -2 the penultimate andso forth.

> The function handles out of range requests without raising an error, butjust limiting the resulting range to the actual length of the string.

## Return value

Bulk reply

## Examples

    redis> set s "This is a string"
    OK
    redis> substr s 0 3
    "This"
    redis> substr s -3 -1
    "ing"
    redis> substr s 0 -1
    "This is a string"
    redis> substr s 9 100000
    " string"