int find(string substring [from] [flags])
string - string to search in.
substring - substring to find.
from - 0-based character index, from which to start search. Default 0.
Returns 0-based index of first character of substring in string. If substring not found, returns -1.
To make more precise search, use findw or findrx.
str s = "Notepad.exe" int i = find(s ".exe") now i is 7