substr

Syntax

substr STRING START [LENGTH]

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"

{{ substr "BatMan" 0 }} → "BatMan"
{{ substr "BatMan" 1 }} → "atMan"

{{ substr "BatMan" 0 -1 }} → "BatMa"
{{ substr "BatMan" 3 -1 }} → "Ma"

{{ substr "BatMan" -3 1 }} → "M"
{{ substr "BatMan" -3 3 }} → "atM"

{{ substr "BatMan" -4 -1 }} → "tMa"
{{ substr "BatMan" -4 -2 }} → "tM"