Detect/Parse Mailing Addresses in Text

Are there any open source/commercial libraries out there that can detect mailing addresses in text, just like how Apple's Mail app underlines addresses on the Mac/iPhone.

I've been doing a little online research and the ideas seem to be either to use Regex or a full on NLP package such as Stanford's NLP, which usually are pretty massive. I doubt iPhone has a 500MB NLP package in there, which makes me to believe there should be an easier way. Too bad UIDataDetectors is not open source.

Thanks,

Drew