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

title	description	godocref	date	publishdate	lastmod	categories	menu	keywords	aliases	signature	workson	hugoversion	relatedfuncs	deprecated
substr	Extracts parts of a string from a specified character's position and returns the specified number of characters.		2017-02-01	2017-02-01	2017-02-01	functions	docs parent functions	strings		substr STRING START [LENGTH]				false

It normally takes two parameters: start and length. It can also take one parameter: start, i.e. length is omitted, in which case the substring starting from start until the end of the string will be returned.

To extract characters from the end of the string, use a negative start number.

In addition, borrowing from the extended behavior described at https://php.net substr, if length is given and is negative, that number of characters will be omitted from the end of string.

{{substr "BatMan" 0 -3}} → "Bat"
{{substr "BatMan" 3 3}} → "Man"