#SUBSTR

Works with string values and bitmap-style string operations.

#Syntax

SUBSTR <key> <start> <end>

#Parameters

• key: Primary key to read or mutate.
• start: Start position, range boundary, or stream id lower bound.
• end: End position or range boundary.

#Returns

Usually returns one value or nil when the requested key, field, or element does not exist.

#Examples

SUBSTR title 0 4

#BetterKV Notes

• Group: String.
• Access: Read-only.
• Status: Implemented in BetterKV and safe to use for read paths.