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

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replace	Replaces all occurrences of the search string with the replacement string.	functions	docs parent functions	replace	replace INPUT OLD NEW [LIMIT] strings.Replace INPUT OLD NEW [LIMIT]	replaceRE

Replace returns a copy of INPUT with all occurrences of OLD replaced with NEW. The number of replacements can be limited with an optional LIMIT argument.

`{{ replace "Batman and Robin" "Robin" "Catwoman" }}`
→ "Batman and Catwoman"

{{ replace "aabbaabb" "a" "z" 2 }} → "zzbbaabb"