---
title: strings.trimLeft() function
description: strings.trimLeft() removes specified leading characters from a string.
url: https://docs.influxdata.com/flux/v0/stdlib/strings/trimleft/
estimated_tokens: 958
product: Flux
version: v0
publisher: InfluxData
canonical: https://docs.influxdata.com/flux/v0/stdlib/strings/trimleft/
date: '2024-04-08T16:01:02-06:00'
lastmod: '2024-04-08T16:01:02-06:00'
---

* Flux 0.18.0+

InfluxDB support

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

##### Function type signature

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

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### v

(Required)
String to to remove characters from.

### cutset

(Required)
Leading characters to trim from the string.

## Examples

### Trim leading periods from all values in a column

```js
import "strings"

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

[](#view-example-input-and-output)

View example input and output

#### 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  |

#### Related

* [strings.trim() function](/flux/v0/stdlib/strings/trim/)
* [strings.trimRight() function](/flux/v0/stdlib/strings/trimright/)
* [strings.trimPrefix() function](/flux/v0/stdlib/strings/trimprefix/)
* [strings.trimSuffix() function](/flux/v0/stdlib/strings/trimsuffix/)
* [strings.trimSpace() function](/flux/v0/stdlib/strings/trimspace/)
| _time | _value | *tag |
| --- | --- | --- |
| _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 |
| --- | --- | --- |
| _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 |

| _time | _value | *tag |
| --- | --- | --- |
| _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 |
| --- | --- | --- |
| _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 |