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44 lines
1.3 KiB
Markdown
44 lines
1.3 KiB
Markdown
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---
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title: strings.ReplaceRE
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description: Returns a copy of INPUT, replacing all occurrences of a regular expression with a replacement pattern.
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categories: []
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keywords: []
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action:
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aliases: [replaceRE]
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related:
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- functions/strings/FindRE
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- functions/strings/FindRESubmatch
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- functions/strings/Replace
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returnType: string
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signatures: ['strings.ReplaceRE PATTERN REPLACEMENT INPUT [LIMIT]']
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aliases: [/functions/replacere]
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---
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{{% include "functions/_common/regular-expressions.md" %}}
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```go-html-template
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{{ $s := "a-b--c---d" }}
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{{ replaceRE `(-{2,})` "-" $s }} → a-b-c-d
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```
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Limit the number of replacements using the LIMIT argument:
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```go-html-template
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{{ $s := "a-b--c---d" }}
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{{ replaceRE `(-{2,})` "-" $s 1 }} → a-b-c---d
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```
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Use `$1`, `$2`, etc. within the replacement string to insert the content of each capturing group within the regular expression:
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```go-html-template
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{{ $s := "http://gohugo.io/docs" }}
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{{ replaceRE "^https?://([^/]+).*" "$1" $s }} → gohugo.io
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```
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{{% note %}}
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You can write and test your regular expression using [regex101.com](https://regex101.com/). Be sure to select the Go flavor before you begin.
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{{% /note %}}
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[RE2]: https://github.com/google/re2/wiki/Syntax
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[string literal]: https://go.dev/ref/spec#String_literals
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