docs-v2/content/flux/v0.x/stdlib/strings/substring.md

title	description	aliases	menu	weight	introduced
strings.substring() function	The strings.substring() function returns a substring based on `start` and `end` parameters. Indices are based on UTF code points.	/influxdb/v2.0/reference/flux/functions/strings/substring/ /influxdb/v2.0/reference/flux/stdlib/strings/substring/ /influxdb/cloud/reference/flux/stdlib/strings/substring/	flux_0_x_ref name parent strings.substring strings	301	0.35.0

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

Output data type: String

import "strings"

strings.substring(v: "influx", start: 0, end: 4)

// returns "infl"

Parameters

v

The string value to search.

start

The starting inclusive index of the substring.

end

The ending exclusive index of the substring.

Examples

Store the first four characters of a string

data
    |> map(fn: (r) => ({r with abbr: strings.substring(v: r.name, start: 0, end: 4)}))