Helper function count occurencies (#1)

* Helper function count occurencies

* Changed function name

Author: lumburovskalina

general.ts

@@ -163,4 +163,14 @@ export function replaceStringEscapeCharacters(str: string, toEscaped: boolean =
         });
     }
     return str;
-}
+}
+
+export function countOccurrences(str: string, search: string): number {
+    let c = 0, p = -1;
+    while (true) {
+        p = str.indexOf(search, p + 1)
+        if (p != -1) c++;
+        else break;
+    }
+    return c;
+}