diff --git a/src/Validators/HexValidator.php b/src/Validators/HexValidator.php
index 30b5500..ade1ae7 100644
--- a/src/Validators/HexValidator.php
+++ b/src/Validators/HexValidator.php
@@ -26,6 +26,6 @@ class HexValidator
         if (!is_string($value)) {
             return false;
         }
-        return (preg_match('/^0x[a-fA-F0-9]+$/', $value) >= 1);
+        return (preg_match('/^0x[a-fA-F0-9]*$/', $value) >= 1);
     }
 }
\ No newline at end of file
diff --git a/test/unit/HexValidatorTest.php b/test/unit/HexValidatorTest.php
new file mode 100644
index 0000000..50e783d
--- /dev/null
+++ b/test/unit/HexValidatorTest.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace Test\Unit;
+
+use Test\TestCase;
+use Web3\Validators\HexValidator;
+
+class HexValidatorTest extends TestCase
+{
+    /**
+     * validator
+     * 
+     * @var \Web3\Validators\HexValidator
+     */
+    protected $validator;
+
+    /**
+     * setUp
+     * 
+     * @return void
+     */
+    public function setUp()
+    {
+        parent::setUp();
+        $this->validator = new HexValidator;
+    }
+
+    /**
+     * testValidate
+     * 
+     * @return void
+     */
+    public function testValidate()
+    {
+        $validator = $this->validator;
+
+        $this->assertEquals(false, $validator->validate('0Xca35b7d915458ef540ade6068dfe2f44e8fa733c'));
+        $this->assertEquals(false, $validator->validate('0XCA35B7D915458EF540ADE6068DFE2F44E8FA733C'));
+        $this->assertEquals(true, $validator->validate('0xcA35b7D915458eF540ade6068Dfe2f44e8fA733ccA35b7D915458eF540ade6068Dfe2f44e8fA733c'));
+        $this->assertEquals(false, $validator->validate('CA35B7D915458EF540ADE6068DFE2F44E8FA733C'));
+        $this->assertEquals(false, $validator->validate('1234'));
+        $this->assertEquals(false, $validator->validate('abcd'));
+        $this->assertEquals(false, $validator->validate(0xCA35B7D915458EF540ADE6068DFE2F44E8FA733C));
+        $this->assertEquals(true, $validator->validate('0xCA35B7D915458EF540ADE6068DFE2F44E8FA733C'));
+        $this->assertEquals(true, $validator->validate('0xeb0b54d62ec3f561c2eebdaebd92432126f0817579c102b062d1a6c1f2ed83e8'));
+        $this->assertEquals(true, $validator->validate('0xeb0b54D62ec3f561C2eebdaebd92432126F0817579c102b062d1a6c1f2ed83e8121233'));
+    }
+}
\ No newline at end of file