diff --git a/core/config.class.inc.php b/core/config.class.inc.php
index 280472e02..28d486731 100644
--- a/core/config.class.inc.php
+++ b/core/config.class.inc.php
@@ -854,10 +854,12 @@ class Config
 		'url_validation_pattern' => [
 			'type' => 'string',
 			'description' => 'Regular expression to validate/detect the format of an URL (URL attributes and Wiki formatting for Text attributes)',
-			'default' => '(https?|ftp)\://([a-zA-Z0-9+!*(),;?&=\$_.-]+(\:[a-zA-Z0-9+!*(),;?&=\$_.-]+)?@)?([a-zA-Z0-9-.]{3,})(\:[0-9]{2,5})?(/([a-zA-Z0-9%+\$_-]\.?)+)*/?(\?[a-zA-Z+&\$_.-][a-zA-Z0-9;:[\]@&%=+/\$_.-]*)?(#[a-zA-Z_.-][a-zA-Z0-9+\$_.-]*)?',
-			//            SHEME.......... USER....................... PASSWORD.......................... HOST/IP........... PORT.......... PATH........................ GET............................................ ANCHOR............................
+			'default' => /** @lang RegExp */
+			'(https?|ftp)\://([a-zA-Z0-9+!*(),;?&=\$_.-]+(\:[a-zA-Z0-9+!*(),;?&=\$_.-]+)?@)?([a-zA-Z0-9-.]{3,})(\:[0-9]{2,5})?(/([a-zA-Z0-9:%+\$_-]\.?)+)*/?(\?[a-zA-Z+&\$_.-][a-zA-Z0-9;:[\]@&%=+/\$_.-]*)?(#[a-zA-Z_.-][a-zA-Z0-9+\$_.-]*)?',
+			// SCHEME....... USER....................... PASSWORD.......................... HOST/IP........... PORT.......... PATH......................... GET............................................ ANCHOR..........................
 			// Example: http://User:passWord@127.0.0.1:8888/patH/Page.php?arrayArgument[2]=something:blah20#myAnchor
-			// Origin of this regexp: http://www.php.net/manual/fr/function.preg-match.php#93824
+			// RegExp source: http://www.php.net/manual/fr/function.preg-match.php#93824
+			// Update with N°4515
 			'value' => '',
 			'source_of_value' => '',
 			'show_in_conf_sample' => true,
@@ -1600,6 +1602,16 @@ class Config
 		return $this->m_aSettings[$sPropCode]['value'];
 	}
 
+	/**
+	 * @param string $sPropCode
+	 *
+	 * @return mixed
+	 */
+	public function GetDefault($sPropCode)
+	{
+		return $this->m_aSettings[$sPropCode]['default'];
+	}
+
 	/**
 	 * Whether the $sPropCode parameter has a custom value or the default one.
 	 *
diff --git a/test/core/AttributeDefTest.inc.php b/test/core/AttributeDefTest.inc.php
index d2b4b3f7a..1ff8168d8 100644
--- a/test/core/AttributeDefTest.inc.php
+++ b/test/core/AttributeDefTest.inc.php
@@ -29,5 +29,4 @@ class AttributeDefTest extends ItopDataTestCase {
 		$this->assertEquals(["status" => "ENUM('active','inactive') CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci"],
 			$aImportColumns);
 	}
-
 }
\ No newline at end of file
diff --git a/test/core/AttributeURLDefaultPattern.php b/test/core/AttributeURLDefaultPattern.php
new file mode 100644
index 000000000..bf647db2d
--- /dev/null
+++ b/test/core/AttributeURLDefaultPattern.php
@@ -0,0 +1,14 @@
+<?php
+
+/**
+ * @since 3.0.0 N°4515
+ * @used-by \Combodo\iTop\Test\UnitTest\Core\AttributeURLTest
+ */
+class AttributeURLDefaultPattern extends AttributeURL {
+	public function GetValidationPattern()
+	{
+		/** @noinspection OneTimeUseVariablesInspection */
+		$oConfig = utils::GetConfig();
+		return $oConfig->GetDefault('url_validation_pattern');
+	}
+}
diff --git a/test/core/AttributeURLTest.php b/test/core/AttributeURLTest.php
new file mode 100644
index 000000000..9d75fcbb0
--- /dev/null
+++ b/test/core/AttributeURLTest.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Combodo\iTop\Test\UnitTest\Core;
+
+use AttributeURLDefaultPattern;
+use Combodo\iTop\Test\UnitTest\ItopTestCase;
+
+/**
+ * @runTestsInSeparateProcesses
+ * @preserveGlobalState disabled
+ * @backupGlobals disabled
+ */
+class AttributeURLTest extends ItopTestCase {
+	public function setUp()
+	{
+		parent::setUp();
+		require_once APPROOT.'core/attributedef.class.inc.php';
+		require_once APPROOT.'test/core/AttributeURLDefaultPattern.php';
+	}
+
+	/**
+	 * @throws \Exception
+	 * @dataProvider CheckFormatProvider
+	 */
+	public function testCheckFormat(string $sUrlValue, int $iExpectedResult): void
+	{
+		$oAttDefUrl = new AttributeURLDefaultPattern('myCode', ["target"=>'_blank', "allowed_values"=>null, "sql"=>'url', "default_value"=>'', "is_null_allowed"=>true, "depends_on"=>array(), "always_load_in_tables"=>false]);
+		$bResult = $oAttDefUrl->CheckFormat($sUrlValue);
+
+		$this->assertSame($iExpectedResult, $bResult);
+	}
+
+	public function CheckFormatProvider(): array
+	{
+		return [
+			'Simple https URL' => ['https://www.combodo.com/itop', 1],
+			'Simple FTP URL' => ['ftp://user:password@myftp.mydomain.com', 1],
+			'Sharepoint URL 1' => ['https://mydomain1.sharepoint.com/:i:/r/sites/DSIMyDept/Shared%20Documents/Architecture%20Technique/02%20-%20R%C3%A9seau/Baie%2025C/Baie%201er/Baie-25C-1er.jpg?csf=1&web=1&e=Il3txR', 1],
+			'Sharepoint URL 2' => ['https://mydomain2.sharepoint.com/:u:/r/sites/DIS/ITSM/00_Admin_iTOP/iTop%20-%20Upgrade%20manuel/Procedure%20upgrade%20Combodo.url?csf=1&web=1&e=DAF0i3', 1],
+			'Alfresco URL 2' => ['http://alfresco.mydomain3.org/share/page/site/books/document-details?nodeRef=workspace://SpacesStore/6274f55f-a25b-4762-a863-77f7066f2034', 1],
+		];
+	}
+}