---
title: strings.ReplaceRE
description: Returns a copy of INPUT, replacing all occurrences of a regular expression with a replacement pattern.
categories: []
keywords: []
params:
  functions_and_methods:
    aliases: [replaceRE]
    returnType: string
    signatures: ['strings.ReplaceRE PATTERN REPLACEMENT INPUT [LIMIT]']
aliases: [/functions/replacere]
---

{{% include "/_common/functions/regular-expressions.md" %}}

```go-html-template
{{ $s := "a-b--c---d" }}
{{ replaceRE `(-{2,})` "-" $s }} → a-b-c-d
```

Limit the number of replacements using the LIMIT argument:

```go-html-template
{{ $s := "a-b--c---d" }}
{{ replaceRE `(-{2,})` "-" $s 1 }} → a-b-c---d
```

Use `$1`, `$2`, etc. within the replacement string to insert the content of each capturing group 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][]. Be sure to select the Go flavor before you begin.

[regex101.com]: https://regex101.com/
