core-bundle/src/Resources/contao/classes/BackendUser.php
public function canEditFieldsOf($table)
	{
		if ($this->isAdmin)
		{
			return true;
		}

		return \count(preg_grep('/^' . preg_quote($table, '/') . '::/', $this->alexf)) > 0;
	}
public function canEditFieldsOf($table)
	{
		if ($this->isAdmin)
		{
			return true;
		}

		return \count(preg_grep('/^' . preg_quote($table, '/') . '::/', $this->alexf)) > 0;
	}
Return true if there is at least one allowed excluded field

@param string $table

@return boolean