Bonus Exercise 3 completed.

src/main/java/BonusExercises.java

@@ -15,17 +15,7 @@ public class BonusExercises {
         return matcher.matches();
     }
 
-    /*
-        This method should find and return the first date in a string.
 
-        Supported formats:
-        - American:   MM/DD/YYYY   (e.g., 12/09/2023)
-        - British:    DD/MM/YYYY   (e.g., 12/09/2023 — same pattern, context matters)
-        - ISO:        YYYY-MM-DD   (e.g., 2024-07-15)
-        - Slash variant: YYYY/MM/DD (e.g., 2025/01/01)
-
-        If no match for a date is found in the string, return null.
-    */
     public String findDate(String string) {
         //Different types of dates
         String[] datePatterns = {
@@ -55,19 +45,27 @@ public class BonusExercises {
         return null;
     }
 
-    /*
-        given a string, implement the method to detect all valid passwords
-        then, it should return the count of them
 
-        a valid password has the following properties:
-        - at least 8 characters
-        - has to include at least one uppercase letter, and at least a lowercase
-        - at least one number and at least a special char "!@#$%^&*"
-        - has no white-space in it
-     */
     public int findValidPasswords(String string) {
-        // todo
-        return -1;
+        //This string matches the conditions for the password
+        String regex = "^(?=.*[A-Z])(?=.*[a-z])(?=.*\\d)(?=.*[!@#$%^&*])(?!.*\\s).{8,}$";
+
+        Pattern pattern = Pattern.compile(regex);
+        Matcher matcher = pattern.matcher(string);
+
+        //Splitting the string by the spaces to check each one
+        String[] words = string.split("\\s+");
+
+        int n = 0;
+
+        //For counting the matches in the string array
+        for (String word : words) {
+            if (pattern.matcher(word).matches()) {
+                n++;
+            }
+        }
+
+        return n;
     }
 
     /*