str_slice($string, $start-at, $end-at:-1)
Extracts a substring from $string. The substring will begin at index $start-at and ends at index $end-at.
Note that unlike some languages, the first character in a Sass string is number 1, the second number 2, and so forth.
Examples: str-slice("abcd", 2, 3) => "bc"
str-slice("abcd", 2) => "bcd"
str-slice("abcd", -3, -2) => "bc"
str-slice("abcd", 2, -2) => "bc" Returns The substring. This will be quoted if and only if $string w