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

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strings.TrimSuffix	Returns a given string s without the provided trailing suffix string. If s doesn't end with suffix, s is returned unchanged.	2017-02-01	2017-02-01	2017-02-01	functions	docs parent functions	strings	strings.TrimSuffix SUFFIX STRING			strings.TrimPrefix	false

Given the string "aabbaa", the specified suffix is only removed if "aabbaa" ends with it:

{{ strings.TrimSuffix "a" "aabbaa" }} → "aabba"
{{ strings.TrimSuffix "aa" "aabbaa" }} → "aabb"
{{ strings.TrimSuffix "aaa" "aabbaa" }} → "aabbaa"