done

AP1403 - RegEx/src/main/java/Exercises.java

@@ -5,55 +5,54 @@
 
 public class Exercises {
 
-    /*
-        complete the method below, so it will validate an email address
-     */
     public boolean validateEmail(String email) {
-        String regex = ""; // todo
+        String regex = "^[a-zA-Z0-9_+&*-]+(?:\\.[a-zA-Z0-9_+&*-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,7}$";
         Pattern pattern = Pattern.compile(regex);
         Matcher matcher = pattern.matcher(email);
-
         return matcher.matches();
     }
 
-    /*
-        this method should find a date in string
-        note that it should be in british or american format
-        if there's no match for a date, return null
-     */
     public String findDate(String string) {
-        // todo
+        String regex = "(0[1-9]|[12][0-9]|3[01])[-/](0[1-9]|1[0-2])[-/](19|20)\\d\\d|\\d{4}[-/](0[1-9]|1[0-2])[-/](0[1-9]|[12][0-9]|3[01])";
+        Pattern pattern = Pattern.compile(regex);
+        Matcher matcher = pattern.matcher(string);
+        if (matcher.find()) {
+            return matcher.group();
+        }
         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 "!@#$%^&*"
-        - has no white-space in it
-     */
     public int findValidPasswords(String string) {
-        // todo
-        return -1;
+        String regex = "(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[!@#$%^&*])[^\\s]{8,}";
+        Pattern pattern = Pattern.compile(regex);
+        Matcher matcher = pattern.matcher(string);
+        int count = 0;
+        while (matcher.find()) {
+            count++;
+        }
+        return count;
     }
 
-    /*
-        you should return a list of *words* which are palindromic
-        by word we mean at least 3 letters with no whitespace in it
-
-        note: your implementation should be case-insensitive, e.g. Aba -> is palindrome
-     */
     public List<String> findPalindromes(String string) {
         List<String> list = new ArrayList<>();
-        // todo
+        String[] words = string.split("\\W+");
+        for (String word : words) {
+            if (word.length() >= 3) {
+                String lowerWord = word.toLowerCase();
+                String reversed = new StringBuilder(lowerWord).reverse().toString();
+                if (lowerWord.equals(reversed)) {
+                    list.add(word);
+                }
+            }
+        }
         return list;
     }
 
     public static void main(String[] args) {
-        // you can test your code here
+        Exercises exercises = new Exercises();
+        System.out.println(exercises.validateEmail("test@example.com"));
+        System.out.println(exercises.findDate("Today's date is 12/04/2025."));
+        System.out.println(exercises.findValidPasswords("Password1! and 1234Pass@ are valid."));
+        System.out.println(exercises.findPalindromes("Madam, this is a level example."));
     }
 }