hugo/docs/content/en/functions/replacere.md

title	description	godocref	date	publishdate	lastmod	categories	menu	keywords	signature	workson	hugoversion	relatedfuncs	deprecated	aliases
replaceRE	Replaces all occurrences of a regular expression with the replacement pattern.		2017-02-01	2017-02-01	2020-09-07	functions	docs parent functions	regex	strings.ReplaceRE PATTERN REPLACEMENT INPUT [LIMIT] replaceRE PATTERN REPLACEMENT INPUT [LIMIT]				false

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.

{{ replaceRE "^https?://([^/]+).*" "$1" "http://gohugo.io/docs" }}` → "gohugo.io"
{{ "http://gohugo.io/docs" | replaceRE "^https?://([^/]+).*" "$1" }}` → "gohugo.io"
{{ replaceRE "a+b" "X" "aabbaabbab" 1 }} → "Xbaabbab"

{{% note %}} Hugo uses Go's Regular Expression package, 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.

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 %}}