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35 lines
1.4 KiB
Markdown
35 lines
1.4 KiB
Markdown
---
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title: replaceRE
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description: Replaces all occurrences of a regular expression with the replacement pattern.
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godocref:
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date: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2020-09-07
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categories: [functions]
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menu:
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docs:
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parent: "functions"
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keywords: [regex]
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signature: ["strings.ReplaceRE PATTERN REPLACEMENT INPUT [LIMIT]", "replaceRE PATTERN REPLACEMENT INPUT [LIMIT]"]
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workson: []
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hugoversion:
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relatedfuncs: []
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deprecated: false
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aliases: []
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---
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`strings.ReplaceRE` returns a copy of `INPUT`, replacing all matches of the regular
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expression `PATTERN` with the replacement text `REPLACEMENT`.
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The number of replacements can be limited with an optional `LIMIT` parameter.
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```
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{{ replaceRE "^https?://([^/]+).*" "$1" "http://gohugo.io/docs" }}` → "gohugo.io"
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{{ "http://gohugo.io/docs" | replaceRE "^https?://([^/]+).*" "$1" }}` → "gohugo.io"
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{{ replaceRE "a+b" "X" "aabbaabbab" 1 }} → "Xbaabbab"
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```
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{{% note %}}
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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).
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If you are just learning RegEx, or at least Go's flavor, you can practice pattern matching in the browser at <https://regex101.com/>.
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{{% /note %}}
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