From 79e65ae658d2d20fe86932611812ddb8c7e138ae Mon Sep 17 00:00:00 2001
From: RafaJEstabile <rafaelaestabile@gmail.com>
Date: Mon, 26 Jan 2026 09:28:05 -0300
Subject: [PATCH] =?UTF-8?q?Ajustes=20na=20implementa=C3=A7=C3=A3o=20do=20U?=
 =?UTF-8?q?LID?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/Ulid.php          | 12 ++++++++----
 src/UlidConstants.php |  1 +
 tests/UlidTest.php    | 12 ++++++++++++
 3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/src/Ulid.php b/src/Ulid.php
index d0d4bef..722f008 100755
--- a/src/Ulid.php
+++ b/src/Ulid.php
@@ -16,14 +16,18 @@ class Ulid
      * @param string $ulid
      * @return bool
      */
-    public function isValidFormat(
-        string $ulid
-    ): bool {
+    public function isValidFormat(string $ulid): bool
+    {
         $validator = UlidConstants::TIME_LENGTH + UlidConstants::RANDOM_LENGTH;
+
         if (strlen($ulid) !== $validator) {
             return false;
         }
-        return true;
+
+        return preg_match(
+            UlidConstants::REGEX,
+            $ulid
+        ) === 1;
     }
 
     /**
diff --git a/src/UlidConstants.php b/src/UlidConstants.php
index 992a9c2..58dcc11 100755
--- a/src/UlidConstants.php
+++ b/src/UlidConstants.php
@@ -9,4 +9,5 @@ class UlidConstants
     const TIME_MAX = 281474976710655;
     const TIME_LENGTH = 10;
     const RANDOM_LENGTH = 16;
+    const REGEX = '/^[0-9A-HJKMNP-TV-Z]{26}$/ ';
 }
diff --git a/tests/UlidTest.php b/tests/UlidTest.php
index 5689cdf..0c69913 100755
--- a/tests/UlidTest.php
+++ b/tests/UlidTest.php
@@ -230,6 +230,18 @@ public function testDecodeTimeInvalidTime()
         $ulid->decodeTime('QS234SAD23RADSWRA3FADQ3RS2');
     }
 
+    /**
+     * @covers Ulid\Ulid::isValidFormat
+     */
+    public function testIsValidFormatDoesNotValidateCharacters()
+    {
+        $ulid = new Ulid();
+
+        $result = $ulid->isValidFormat('01E475VQGHNW990PVHXFDT4C6W');
+
+        $this->assertTrue($result);
+    }
+
     protected function tearDown(): void
     {
         //