string extract(str, from, to)
string str;
int from, to;

Extract a substring from a string. Character 0 is first character.
'extract(str, n)' will return a substring from characer number 'n' to the end.
'ectract(str, i, j)' will return a string from character 'i' to
character 'j'.

See also efun/sscanf efun/explode