SUBSTR key start end
Time complexity: O(N) where N is the length of the returned string. The complexity is ultimately determined by the returned length, but because creating a substring from an existing string is very cheap, it can be considered O(1) for small strings.
ACL categories: @read, @string, @slow
Returns the substring of the string value stored at
key, determined by the
end (both are inclusive).
Negative offsets can be used in order to provide an offset starting from the end
of the string.
So -1 means the last character, -2 the penultimate and so forth.
The function handles out of range requests by limiting the resulting range to the actual length of the string.
Bulk string reply: the substring indicated by
end of the string stored at key
dragonfly> SET mykey "This is a string"
dragonfly> GETRANGE mykey 0 3
dragonfly> GETRANGE mykey -3 -1
dragonfly> GETRANGE mykey 0 -1
"This is a string"
dragonfly> GETRANGE mykey 10 100