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String

unquote($string) Removes quotes from a string.
quote($string) Adds quotes to a string.
str-length($string) Returns the number of characters in a string.
str-insert($string, $insert, $index) Inserts $insert into $string at $index.
str-index($string, $substring) Returns the index of the first occurance of $substring in $string.
str-slice($string, $start-at, [$end-at]) Extracts a substring from $string.
to-upper-case($string) Converts a string to upper case.
to-lower-case($string) Converts a string to lower case.
The index starts from 1 instead of 0.
$a: Hello;
##{str-slice($a,3)} {
   color: green;
}

#llo {
  color: green;
}