Initial data commit

Task/String-matching/F-Sharp/string-matching.fs

@@ -0,0 +1,24 @@
+[<EntryPoint>]
+let main args =
+
+    let text = "一二三四五六七八九十"
+    let starts = "一二"
+    let ends = "九十"
+    let contains = "五六"
+    let notContains = "百"
+
+    printfn "text = %A" text
+    printfn "starts with %A: %A" starts (text.StartsWith(starts))
+    printfn "starts with %A: %A" ends (text.StartsWith(ends))
+    printfn "ends with %A: %A" ends (text.EndsWith(ends))
+    printfn "ends with %A: %A" starts (text.EndsWith(starts))
+    printfn "contains %A: %A" contains (text.Contains(contains))
+    printfn "contains %A: %A" notContains (text.Contains(notContains))
+    printfn "substring %A begins at position %d (zero-based)" contains (text.IndexOf(contains))
+    let text2 = text + text
+    printfn "text = %A" text2
+    Seq.unfold (fun (n : int) ->
+            let idx = text2.IndexOf(contains, n)
+            if idx < 0 then None else Some (idx, idx+1)) 0
+    |> Seq.iter (printfn "substring %A begins at position %d (zero-based)" contains)
+    0