---
title: strings.replace() function
description: >
  `strings.replace()` replaces the first `i` non-overlapping instances of a substring with
  a specified replacement.
menu:
  flux_v0_ref:
    name: strings.replace
    parent: strings
    identifier: strings/replace
weight: 101
---

<!------------------------------------------------------------------------------

IMPORTANT: This page was generated from comments in the Flux source code. Any
edits made directly to this page will be overwritten the next time the
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To make updates to this documentation, update the function comments above the
function definition in the Flux source code:

https://github.com/influxdata/flux/blob/master/stdlib/strings/strings.flux#L651-L651

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Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md

------------------------------------------------------------------------------->

`strings.replace()` replaces the first `i` non-overlapping instances of a substring with
a specified replacement.



##### Function type signature

```js
(i: int, t: string, u: string, v: string) => string
```

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

## Parameters

### v
({{< req >}})
String value to search.



### t
({{< req >}})
Substring value to replace.



### u
({{< req >}})
Replacement for `i` instances of `t`.



### i
({{< req >}})
Number of non-overlapping `t` matches to replace.




## Examples

### Replace a specific number of string matches

```js
import "sampledata"
import "strings"

sampledata.string()
    |> map(fn: (r) => ({r with _value: strings.replace(v: r._value, t: "p", u: "XX", i: 2)}))

```

{{< expand-wrapper >}}
{{% expand "View example input and output" %}}

#### Input data

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

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


#### Output data

| _time                | _value        | *tag |
| -------------------- | ------------- | ---- |
| 2021-01-01T00:00:00Z | smXXl_g9qczs  | t1   |
| 2021-01-01T00:00:10Z | smXXl_0mgv9n  | t1   |
| 2021-01-01T00:00:20Z | smXXl_XXhw664 | t1   |
| 2021-01-01T00:00:30Z | smXXl_guvzy4  | t1   |
| 2021-01-01T00:00:40Z | smXXl_5v3cce  | t1   |
| 2021-01-01T00:00:50Z | smXXl_s9fmgy  | t1   |

| _time                | _value        | *tag |
| -------------------- | ------------- | ---- |
| 2021-01-01T00:00:00Z | smXXl_b5eida  | t2   |
| 2021-01-01T00:00:10Z | smXXl_eu4oxXX | t2   |
| 2021-01-01T00:00:20Z | smXXl_5g7tz4  | t2   |
| 2021-01-01T00:00:30Z | smXXl_sox1ut  | t2   |
| 2021-01-01T00:00:40Z | smXXl_wfm757  | t2   |
| 2021-01-01T00:00:50Z | smXXl_dtn2bv  | t2   |

{{% /expand %}}
{{< /expand-wrapper >}}