docs-v2/content/flux/v0/stdlib/strings/trimleft.md

title	description	menu	weight
strings.trimLeft() function	`strings.trimLeft()` removes specified leading characters from a string.	flux_v0_ref name parent identifier strings.trimLeft strings strings/trimLeft	101

strings.trimLeft() removes specified leading characters from a string.

Function type signature

(cutset: string, v: string) => string

{{% caption %}} For more information, see Function type signatures. {{% /caption %}}

Parameters

v

({{< req >}}) String to to remove characters from.

cutset

({{< req >}}) Leading characters to trim from the string.

Examples

Trim leading periods from all values in a column

import "strings"

data
    |> map(fn: (r) => ({r with _value: strings.trimLeft(v: r._value, cutset: ".")}))

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Input data

_time	_value	*tag
2021-01-01T00:00:00Z	...smpl_g9qczs	t1
2021-01-01T00:00:10Z	...smpl_0mgv9n	t1
2021-01-01T00:00:20Z	...smpl_phw664	t1
2021-01-01T00:00:30Z	...smpl_guvzy4	t1
2021-01-01T00:00:40Z	...smpl_5v3cce	t1
2021-01-01T00:00:50Z	...smpl_s9fmgy	t1

_time	_value	*tag
2021-01-01T00:00:00Z	...smpl_b5eida	t2
2021-01-01T00:00:10Z	...smpl_eu4oxp	t2
2021-01-01T00:00:20Z	...smpl_5g7tz4	t2
2021-01-01T00:00:30Z	...smpl_sox1ut	t2
2021-01-01T00:00:40Z	...smpl_wfm757	t2
2021-01-01T00:00:50Z	...smpl_dtn2bv	t2

Output data

_time	_value	*tag
2021-01-01T00:00:00Z	smpl_g9qczs	t1
2021-01-01T00:00:10Z	smpl_0mgv9n	t1
2021-01-01T00:00:20Z	smpl_phw664	t1
2021-01-01T00:00:30Z	smpl_guvzy4	t1
2021-01-01T00:00:40Z	smpl_5v3cce	t1
2021-01-01T00:00:50Z	smpl_s9fmgy	t1

_time	_value	*tag
2021-01-01T00:00:00Z	smpl_b5eida	t2
2021-01-01T00:00:10Z	smpl_eu4oxp	t2
2021-01-01T00:00:20Z	smpl_5g7tz4	t2
2021-01-01T00:00:30Z	smpl_sox1ut	t2
2021-01-01T00:00:40Z	smpl_wfm757	t2
2021-01-01T00:00:50Z	smpl_dtn2bv	t2

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