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---
title: replaceRE
description: Returns a string, replacing all occurrences of a regular expression with a replacement pattern.
categories: [functions]
menu:
docs:
parent: functions
keywords: [regex]
signature:
- "replaceRE PATTERN REPLACEMENT INPUT [LIMIT]"
- "strings.ReplaceRE PATTERN REPLACEMENT INPUT [LIMIT]"
relatedfuncs: [findRE, FindRESubmatch, replace]
---
By default, `replaceRE` replaces all matches. You can limit the number of matches with an optional LIMIT argument.
{{% readfile file="/functions/common/regular-expressions.md" %}}
This example replaces two or more consecutive hyphens with a single hyphen:
```go-html-template
{{ $s := "a-b--c---d" }}
{{ replaceRE `(-{2,})` "-" $s }} → a-b-c-d
```
To limit the number of replacements to one:
```go-html-template
{{ $s := "a-b--c---d" }}
{{ replaceRE `(-{2,})` "-" $s 1 }} → a-b-c---d
```
You can use `$1`, `$2`, etc. within the replacement string to insert the groups captured within the regular expression:
```go-html-template
{{ $s := "http://gohugo.io/docs" }}
{{ replaceRE "^https?://([^/]+).*" "$1" $s }} → gohugo.io
```
{{% note %}}
You can write and test your regular expression using [regex101.com](https://regex101.com/). Be sure to select the Go flavor before you begin.
{{% /note %}}
[RE2]: https://github.com/google/re2/wiki/Syntax
[string literal]: https://go.dev/ref/spec#String_literals
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