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---
title: replaceRE
description: Replaces all occurrences of a regular expression with the replacement pattern.
date: 2017-02-01
publishdate: 2017-02-01
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lastmod: 2020-09-07
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categories: [functions]
menu:
docs:
parent: "functions"
keywords: [regex]
Squashed 'docs/' changes from 4895c29c5..9abd3043a 9abd3043a Add docs for shimming JS libraries 6a1c8dcd7 Update sitemap-template.md (#1245) 37c397332 Update frontends.md a0f86f6df Update configuration.md bb00cb2c1 Update page-bundles.md 773212de6 Restructure and simplify fcba7dddf Some minor clarifications of weight sorting 759b967fc Update configuration-markup.md 56708f0b7 module import path remove slash at end 59f4f4acd Doc: Fix typo in hugo command faacf2e97 Clarify pagination documentation (#1208) d8eb60887 netlify: Bump to 0.75.1 8cedf6231 Merge branch 'temp751' 188e2bf56 releaser: Add release notes to /docs for release of 0.75.1 c96d4b7a3 Update index.md 1a9d192f7 Update index.md 32731b916 Update index.md a5bfa0c9a Restore the ... home page b6850bf96 Release 0.75.0 d6e5e624f releaser: Add release notes to /docs for release of 0.75.0 8cd6b4f47 typo: already -> already 2cb2b22bb Merge commit '534ae9c57a902aea9ed6e62390dec11fa74b7122' e3525de23 docs: Regen docs helper fd746dd83 docs: Regenerate CLI docs e20127980 Add "hugo mod npm pack" 8e82c7ce1 markup/highlight: Add support to linkable line anchors on Chroma 21e94911b markup/asciidocext: Fix AsciiDoc TOC with code 50b8dace5 modules: Add noVendor to module config d05b541fe modules: Make ignoreVendor a glob pattern c946082e7 docs: Update replaceRE func 149054341 docs: Update replace func d917567df docs: Update merge function f1e093c92 docs: Regen CLI docs c7bac967d docs: Regen docs helper 7a38f7a45 Merge commit '7d7771b673e5949f554515a2c236b23192c765c8' 1a5a7263a markup/asciidoc: Add support for .TableOfContents git-subtree-dir: docs git-subtree-split: 9abd3043a9214b390e8cc148f4588bf630620851
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signature: ["strings.ReplaceRE PATTERN REPLACEMENT INPUT [LIMIT]", "replaceRE PATTERN REPLACEMENT INPUT [LIMIT]"]
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workson: []
hugoversion:
relatedfuncs: []
deprecated: false
aliases: []
---
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`strings.ReplaceRE` returns a copy of `INPUT`, replacing all matches of the regular
expression `PATTERN` with the replacement text `REPLACEMENT`.
The number of replacements can be limited with an optional `LIMIT` parameter.
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```
{{ replaceRE "^https?://([^/]+).*" "$1" "http://gohugo.io/docs" }}` → "gohugo.io"
{{ "http://gohugo.io/docs" | replaceRE "^https?://([^/]+).*" "$1" }}` → "gohugo.io"
Squashed 'docs/' changes from 4895c29c5..9abd3043a 9abd3043a Add docs for shimming JS libraries 6a1c8dcd7 Update sitemap-template.md (#1245) 37c397332 Update frontends.md a0f86f6df Update configuration.md bb00cb2c1 Update page-bundles.md 773212de6 Restructure and simplify fcba7dddf Some minor clarifications of weight sorting 759b967fc Update configuration-markup.md 56708f0b7 module import path remove slash at end 59f4f4acd Doc: Fix typo in hugo command faacf2e97 Clarify pagination documentation (#1208) d8eb60887 netlify: Bump to 0.75.1 8cedf6231 Merge branch 'temp751' 188e2bf56 releaser: Add release notes to /docs for release of 0.75.1 c96d4b7a3 Update index.md 1a9d192f7 Update index.md 32731b916 Update index.md a5bfa0c9a Restore the ... home page b6850bf96 Release 0.75.0 d6e5e624f releaser: Add release notes to /docs for release of 0.75.0 8cd6b4f47 typo: already -> already 2cb2b22bb Merge commit '534ae9c57a902aea9ed6e62390dec11fa74b7122' e3525de23 docs: Regen docs helper fd746dd83 docs: Regenerate CLI docs e20127980 Add "hugo mod npm pack" 8e82c7ce1 markup/highlight: Add support to linkable line anchors on Chroma 21e94911b markup/asciidocext: Fix AsciiDoc TOC with code 50b8dace5 modules: Add noVendor to module config d05b541fe modules: Make ignoreVendor a glob pattern c946082e7 docs: Update replaceRE func 149054341 docs: Update replace func d917567df docs: Update merge function f1e093c92 docs: Regen CLI docs c7bac967d docs: Regen docs helper 7a38f7a45 Merge commit '7d7771b673e5949f554515a2c236b23192c765c8' 1a5a7263a markup/asciidoc: Add support for .TableOfContents git-subtree-dir: docs git-subtree-split: 9abd3043a9214b390e8cc148f4588bf630620851
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{{ replaceRE "a+b" "X" "aabbaabbab" 1 }} → "Xbaabbab"
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```
{{% note %}}
Hugo uses Go's [Regular Expression package](https://golang.org/pkg/regexp/), which is the same general syntax used by Perl, Python, and other languages but with a few minor differences for those coming from a background in PCRE. For a full syntax listing, see the [GitHub wiki for re2](https://github.com/google/re2/wiki/Syntax).
If you are just learning RegEx, or at least Go's flavor, you can practice pattern matching in the browser at <https://regex101.com/>.
{{% /note %}}
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