<p>I've been looking for a simple regex for URLs, does anybody have one handy that works well?  I didn't find one with the zend framework validation classes and have seen several implementations.</p>

I used this on a few projects, I don't believe I've run into issues, but I'm sure it's not exhaustive:
```
```
$text = preg_replace(
  '#((https?|ftp)://(\S*?\.\S*?))([\s)\[\]{},;"\':<]|\.\s|$)#i',
  "'<a href=\"$1\" target=\"_blank\">$3</a>$4'",
  $text
);
```
```
Most of the random junk at the end is to deal with situations like
```
http://domain.example.
```
in a sentence (to avoid matching the trailing period). I'm sure it could be cleaned up but since it worked. I've more or less just copied it over from project to project.