strings.substring() function

strings.substring() returns a substring based on start and end parameters. These parameters are represent indices of UTF code points in the string.

When start or end are past the bounds of the string, respectively the start or end of the string is assumed. When end is less than or equal to start an empty string is returned.

Function type signature
(end: int, start: int, v: string) => string

For more information, see Function type signatures.



(Required) String value to search for.


(Required) Starting inclusive index of the substring.


(Required) Ending exclusive index of the substring.


Return part of a string based on character index

import "sampledata"
import "strings"

    |> map(fn: (r) => ({r with _value: strings.substring(v: r._value, start: 5, end: 9)}))

View example input and output

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The future of Flux

Flux is going into maintenance mode. You can continue using it as you currently are without any changes to your code.

Flux is going into maintenance mode and will not be supported in InfluxDB 3.0. This was a decision based on the broad demand for SQL and the continued growth and adoption of InfluxQL. We are continuing to support Flux for users in 1.x and 2.x so you can continue using it with no changes to your code. If you are interested in transitioning to InfluxDB 3.0 and want to future-proof your code, we suggest using InfluxQL.

For information about the future of Flux, see the following: