substr
Extracts parts of a string from a specified character’s position and returns the specified number of characters.
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 "abcdef" 0 }} → "abcdef"
{{ substr "abcdef" 1 }} → "bcdef"
{{ substr "abcdef" 0 1 }} → "a"
{{ substr "abcdef" 1 1 }} → "b"
{{ substr "abcdef" 0 -1 }} → "abcde"
{{ substr "abcdef" 1 -1 }} → "bcde"
{{ substr "abcdef" -1 }} → "f"
{{ substr "abcdef" -2 }} → "ef"
{{ substr "abcdef" -1 1 }} → "f"
{{ substr "abcdef" -2 1 }} → "e"
{{ substr "abcdef" -3 -1 }} → "de"
{{ substr "abcdef" -3 -2 }} → "d"