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	diff --git a/src/Identifiers/UUID.php b/src/Identifiers/UUID.php
	index dd842d2..80626b7 100644
	--- a/src/Identifiers/UUID.php
	+++ b/src/Identifiers/UUID.php
	@@ -1,43 +1,49 @@
	<?php
	declare(strict_types=1);

	namespace Keruald\OmniTools\Identifiers;

	class UUID {

	+ const UUID_REGEXP = "/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/";
	+
	/**
	* @return string A RFC 4122 compliant v4 UUID
	*/
	public static function UUIDv4 () : string {
	// Code by Andrew Moore
	// See http://php.net/manual/en/function.uniqid.php#94959
	// https://www.ietf.org/rfc/rfc4122.txt

	return sprintf(
	'%04x%04x-%04x-%04x-%04x-%04x%04x%04x',

	// 32 bits for "time_low"
	mt_rand(0, 0xffff), mt_rand(0, 0xffff),

	// 16 bits for "time_mid"
	mt_rand(0, 0xffff),

	// 16 bits for "time_hi_and_version",
	// four most significant bits holds version number 4
	mt_rand(0, 0x0fff) \| 0x4000,

	// 16 bits, 8 bits for "clk_seq_hi_res",
	// 8 bits for "clk_seq_low",
	// two most significant bits holds zero and one for variant DCE1.1
	mt_rand(0, 0x3fff) \| 0x8000,

	// 48 bits for "node"
	mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
	);
	}

	public static function UUIDv4WithoutHyphens () : string {
	return str_replace("-", "", self::UUIDv4());
	}

	+ public static function isUUID ($string) : bool {
	+ return (bool)preg_match(self::UUID_REGEXP, $string);
	+ }
	+
	}
	diff --git a/tests/Identifiers/UUIDTest.php b/tests/Identifiers/UUIDTest.php
	index 1a81ad1..28d62ba 100644
	--- a/tests/Identifiers/UUIDTest.php
	+++ b/tests/Identifiers/UUIDTest.php
	@@ -1,39 +1,49 @@
	<?php
	declare(strict_types=1);

	namespace Keruald\OmniTools\Tests\Identifiers;

	use Keruald\OmniTools\Identifiers\UUID;
	use Phpunit\Framework\TestCase;

	class UUIDTest extends TestCase {

	public function testUUIDv4 () : void {
	$uuid = UUID::UUIDv4();

	$this->assertEquals(
	36, strlen($uuid),
	"UUID size must be 36 characters."
	);

	$re = "/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/";
	$this->assertRegExp($re, $uuid);
	}

	public function testUUIDv4WithoutHyphens () : void {
	$uuid = UUID::UUIDv4WithoutHyphens();

	$this->assertEquals(
	32, strlen($uuid),
	"UUID size must be 36 characters, and there are 4 hyphens, so here 32 characters are expected."
	);

	$re = "/[0-9a-f]/";
	$this->assertRegExp($re, $uuid);
	}

	public function testUUIDv4AreUnique () : void {
	$this->assertNotEquals(UUID::UUIDv4(), UUID::UUIDv4());
	}

	+ public function testIsUUID () : void {
	+ $this->assertTrue(UUID::isUUID("e14d5045-4959-11e8-a2e6-0007cb03f249"));
	+ $this->assertFalse(
	+ UUID::isUUID("e14d5045-4959-11e8-a2e6-0007cb03f249c"),
	+ "The method shouldn't allow arbitrary size strings."
	+ );
	+ $this->assertFalse(UUID::isUUID("d825a90a27e7f161a07161c3a37dce8e"));
	+
	+ }
	+
	}

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