Gotta wonder if we need it if it was a goner during a whole year without being noticed... No problem with keeping it since it's part of Symfony itself, though, [they define](https://github.com/symfony/symfony1/blob/1.4/lib/helper/TextHelper.php) the constant like this:
```php
if (!defined('SF_AUTO_LINK_RE'))
{
  define('SF_AUTO_LINK_RE', '…'
```
I haven't found any other occurrence of this constant throughout the project, but you might want to have that little verification.