fix: Reject leading zeros in ipv4 format octets

Author: thced

src/main/java/com/retailsvc/http/validate/DefaultValidator.java

@@ -50,7 +50,8 @@ private record FormatCheck(Predicate<String> isValid, String message) {}
   private static final Pattern EMAIL = Pattern.compile("^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$");
 
   private static final Pattern IPV4 =
-      Pattern.compile("^((25[0-5]|2[0-4]\\d|1?\\d?\\d)\\.){3}(25[0-5]|2[0-4]\\d|1?\\d?\\d)$");
+      Pattern.compile(
+          "^((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)$");
 
   private static final Pattern IPV6 =
       Pattern.compile(

src/test/java/com/retailsvc/http/validate/StringIntegerNumberTest.java

@@ -128,6 +128,9 @@ void stringFormatIpv4() {
     assertThatThrownBy(() -> v.validate("1.2.3", s, "/v"))
         .extracting(t -> ((ValidationException) t).error().keyword())
         .isEqualTo("format");
+    assertThatThrownBy(() -> v.validate("01.02.03.04", s, "/v"))
+        .extracting(t -> ((ValidationException) t).error().keyword())
+        .isEqualTo("format");
   }
 
   @Test