extract - extract a subpart of a string
string extract(string str, void|int start, void|int to)
Get a subpart of a string. Both 'start' and 'to' is a position in
'str'. If the position(s) is negative then it is counted from the
end of the string.
If the 'start' is bigger than 'to' then an empty string is
returned. An empty string is also returned if the subpart is
outside the string in its entirety.
Both positions is optional. If no position is given then 'str' is
If only 'start' is given then a string from 'start' to the end of
'str' is returned.
- SEE ALSO