diff --git a/core-java-modules/core-java-regex/src/test/java/com/baeldung/regex/RegexUnitTest.java b/core-java-modules/core-java-regex/src/test/java/com/baeldung/regex/RegexUnitTest.java
index b3c3a91a09..909894ec55 100644
--- a/core-java-modules/core-java-regex/src/test/java/com/baeldung/regex/RegexUnitTest.java
+++ b/core-java-modules/core-java-regex/src/test/java/com/baeldung/regex/RegexUnitTest.java
@@ -481,6 +481,50 @@ public class RegexUnitTest {
 
     }
 
+    @Test
+    public void whenMatchesTenDigitsNumber_thenCorrect() {
+        Pattern pattern = Pattern.compile("^\\d{10}$");
+        Matcher matcher = pattern.matcher("1234567890");
+        assertTrue(matcher.matches());
+    }
+    
+    @Test
+    public void whenMatchesTenDigitsNumberWhitespacesHyphen_thenCorrect() {
+        Pattern pattern = Pattern.compile("^(\\d{3}[- ]?){2}\\d{4}$");
+        Matcher matcher = pattern.matcher("123 456 7890");
+        assertTrue(matcher.matches());
+    }
+    
+    @Test
+    public void whenMatchesTenDigitsNumberParenthesis_thenCorrect() {
+        Pattern pattern = Pattern.compile("^\\(?\\d{3}\\)?[- ]?\\d{3}[- ]?\\d{4}$");
+        Matcher matcher = pattern.matcher("(123)-456-7890");
+        assertTrue(matcher.matches());
+    }
+    
+    @Test
+    public void whenMatchesTenDigitsNumberPrefix_thenCorrect() {
+        Pattern pattern = Pattern.compile("^(\\+\\d{1,3}( )?)?\\(?\\d{3}\\)?[- ]?\\d{3}[- ]?\\d{4}$");
+        Matcher matcher = pattern.matcher("+111 (123)-456-7890");
+        assertTrue(matcher.matches());
+    }
+    
+    @Test
+    public void whenMatchesPhoneNumber_thenCorrect() {
+        String patterns = "^(\\+\\d{1,3}( )?)?\\(?\\d{3}\\)?[- ]?\\d{3}[- ]?\\d{4}$" + 
+                         "|^(\\+\\d{1,3}( )?)?(\\d{3}[ ]?){2}\\d{3}$" + 
+                         "|^(\\+\\d{1,3}( )?)?(\\d{3}[ ]?)(\\d{2}[ ]?){2}\\d{2}$";
+        
+        String[] validPhoneNumbers = {"1234567890","123 456 7890", "(123)-456-7890", "+111 (123)-456-7890",
+                                      "123 456 789", "+111 123 456 789", "123 45 67 89", "+111 123 45 67 89"};
+        
+        Pattern pattern = Pattern.compile(patterns);
+        for(String phoneNumber : validPhoneNumbers) {
+            Matcher matcher = pattern.matcher(phoneNumber);
+            assertTrue(matcher.matches());
+        }
+    }
+
     public synchronized static int runTest(String regex, String text) {
         pattern = Pattern.compile(regex);
         matcher = pattern.matcher(text);