Assert\Assertion::uuid PHP Method

    public static function uuid($value, $message = null, $propertyPath = null)
    {
        $value = str_replace(array('urn:', 'uuid:', '{', '}'), '', $value);
        if ($value === '00000000-0000-0000-0000-000000000000') {
            return true;
        }
        if (!preg_match('/^[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{12}$/', $value)) {
            $message = sprintf($message ?: 'Value "%s" is not a valid UUID.', static::stringify($value));
            throw static::createException($value, $message, static::INVALID_UUID, $propertyPath);
        }
        return true;
    }

 /**
  * @param string $workflowName
  * @param string $workflowId
  * @return CreateWorkflow
  */
 public static function withName($workflowName, $workflowId)
 {
     Assertion::string($workflowName);
     Assertion::notEmpty($workflowName);
     Assertion::uuid($workflowId);
     return new self(__CLASS__, ['workflow_id' => $workflowId, 'name' => $workflowName]);
 }