Prev: strsub
substr(string, start) substr(string, start, length)This function returns a substring of string beginning at the character numbered by start. If length is specified, then the substring has that length; otherwise, the length is given by
(length(string) - (start - 1)). If start is
less than 1, if the length of the substring is negative, or if
the sum of start and length is greater than one more than
the length of the string, then substr() throws a ~range
error.
Examples:
substr("foobar", 2, 3)
=> "oob"
substr("foobar", 3)
=> "obar"
substr("foobar", 7)
=> ""