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

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strings.TrimPrefix	Returns a given string s without the provided leading prefix string. If s doesn't start with prefix, s is returned unchanged.		2017-02-01	2017-02-01	2017-02-01	functions	docs parent functions	strings	strings.TrimPrefix PREFIX STRING			strings.TrimSuffix	false

Given the string "aabbaa", the specified prefix is only removed if "aabbaa" starts with it:

{{ strings.TrimPrefix "a" "aabbaa" }} → "abbaa"
{{ strings.TrimPrefix "aa" "aabbaa" }} → "bbaa"
{{ strings.TrimPrefix "aaa" "aabbaa" }} → "aabbaa"