|  |  5.1.40 find 
See
 string.Syntax:find (string_expression,substring_expression)
 find (string_expression,substring_expression,int_expression)Type:int
Purpose:returns the first position of the substring
in the string or 0 (if not found),
starts the search at the position given in the 3rd argument.
Example:|  |   find("Aac","a");
==> 2
  find("abab","a"+"b");
==> 1
  find("abab","a"+"b",2);
==> 3
  find("abab","ab",3);
==> 3
  find("0123","abcd");
==> 0
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