Reg Exp and sentences

Hi

Im trying to get a solid regular expression that identifies sentences
from a text chunk and that throws away anything that isnt.

Example:

pjkoqwe () asdkj() asdasd...... dasdkasjk ** This is a proper sentence,
right here. Hejrkjlekk werkwe wer werjlkj! Wedkljew erewrkjkj?
Wwlkjfdskjsdflk sdlkfjsdsd sdflkjsd sdfkjsdf, sdfklj sdflkjsdf lksdfj.
1223 sd dskj() sdkjas | asd| |sdasda sadkjasd

Would result in:

This is a proper sentence, right here. Hejrkjlekk werkwe wer werjlkj!
Wedkljew erewrkjkj? Wwlkjfdskjsdflk sdlkfjsdsd sdflkjsd sdfkjsdf,
sdfklj sdflkjsdf lksdfj.

Eg something that looks for a length more than say 5 words, that starts
with an upper case letter, can include ,()- and space and ends with an
..!?

Thanks
M

.