terraform/website/docs/language/functions/replace.mdx

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---
page_title: replace - Functions - Configuration Language
description: |-
The replace function searches a given string for another given substring,
and replaces all occurrences with a given replacement string.
---
# `replace` Function
`replace` searches a given string for another given substring, and replaces
each occurrence with a given replacement string.
```hcl
replace(string, substring, replacement)
```
If `substring` is wrapped in forward slashes, it is treated as a regular
expression, using the same pattern syntax as
[`regex`](/language/functions/regex). If using a regular expression for the substring
argument, the `replacement` string can incorporate captured strings from
the input by using an `$n` sequence, where `n` is the index or name of a
capture group.
## Examples
```
> replace("1 + 2 + 3", "+", "-")
1 - 2 - 3
> replace("hello world", "/w.*d/", "everybody")
hello everybody
```
## Related Functions
- [`regex`](/language/functions/regex) searches a given string for a substring matching a
given regular expression pattern.