hugo/docs/content/en/functions/strings/ReplaceRE.md

title	linkTitle	description	categories	keywords	menu	function	relatedFunctions	aliases
strings.ReplaceRE	replaceRE	Returns a string, replacing all occurrences of a regular expression with a replacement pattern.	functions		docs parent functions	aliases returnType signatures replaceRE string strings.ReplaceRE PATTERN REPLACEMENT INPUT [LIMIT]	strings.FindRE strings.FindRESubmatch strings.Replace strings.ReplaceRE	/functions/replacere

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:

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

To limit the number of replacements to one:

{{ $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:

{{ $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. {{% /note %}}