diff --git a/core-java-modules/core-java-datetime-string/src/main/java/com/baeldung/regexp/datepattern/gregorian/February29thMatcher.java b/core-java-modules/core-java-datetime-string/src/main/java/com/baeldung/regexp/datepattern/gregorian/February29thMatcher.java
index b0243ae48f..629f15b2dd 100644
--- a/core-java-modules/core-java-datetime-string/src/main/java/com/baeldung/regexp/datepattern/gregorian/February29thMatcher.java
+++ b/core-java-modules/core-java-datetime-string/src/main/java/com/baeldung/regexp/datepattern/gregorian/February29thMatcher.java
@@ -7,7 +7,7 @@ import java.util.regex.Pattern;
 public class February29thMatcher implements DateMatcher {
 
     private static final Pattern DATE_PATTERN = Pattern.compile(
-            "^((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)$");
+            "^((2000|2400|2800|(19|2[0-9])(0[48]|[2468][048]|[13579][26]))-02-29)$");
 
     @Override
     public boolean matches(String date) {
diff --git a/core-java-modules/core-java-datetime-string/src/main/java/com/baeldung/regexp/datepattern/gregorian/GregorianDateMatcher.java b/core-java-modules/core-java-datetime-string/src/main/java/com/baeldung/regexp/datepattern/gregorian/GregorianDateMatcher.java
index fc8abdb201..13be452910 100644
--- a/core-java-modules/core-java-datetime-string/src/main/java/com/baeldung/regexp/datepattern/gregorian/GregorianDateMatcher.java
+++ b/core-java-modules/core-java-datetime-string/src/main/java/com/baeldung/regexp/datepattern/gregorian/GregorianDateMatcher.java
@@ -7,7 +7,7 @@ import java.util.regex.Pattern;
 class GregorianDateMatcher implements DateMatcher {
 
     private static final Pattern DATE_PATTERN = Pattern.compile(
-            "^((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)$" 
+            "^((2000|2400|2800|(19|2[0-9])(0[48]|[2468][048]|[13579][26]))-02-29)$" 
             + "|^(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))$"
             + "|^(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))$" 
             + "|^(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30))$");
diff --git a/core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/regexp/datepattern/gregorian/testhelper/GregorianDateTestHelper.java b/core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/regexp/datepattern/gregorian/testhelper/GregorianDateTestHelper.java
index 6429e4fe2d..b7fb267077 100644
--- a/core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/regexp/datepattern/gregorian/testhelper/GregorianDateTestHelper.java
+++ b/core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/regexp/datepattern/gregorian/testhelper/GregorianDateTestHelper.java
@@ -37,6 +37,8 @@ public class GregorianDateTestHelper {
     }
 
     public void assertFebruary29th() {
+    	Assert.assertTrue(matcher.matches("1904-02-29"));
+    	Assert.assertTrue(matcher.matches("1996-02-29"));
         Assert.assertTrue(matcher.matches("2000-02-29"));
         Assert.assertTrue(matcher.matches("2400-02-29"));
         Assert.assertTrue(matcher.matches("2800-02-29"));
@@ -44,6 +46,8 @@ public class GregorianDateTestHelper {
         Assert.assertTrue(matcher.matches("2024-02-29"));
         Assert.assertTrue(matcher.matches("2028-02-29"));
 
+        Assert.assertFalse(matcher.matches("1900-02-29"));
+        Assert.assertFalse(matcher.matches("1999-02-29"));
         Assert.assertFalse(matcher.matches("2017-02-29"));
         Assert.assertFalse(matcher.matches("2018-02-29"));
         Assert.assertFalse(matcher.matches("2019-02-29"));