Remove all tags except Bold, Italic, Underline, New Lines like <br> <p>

hello guys, could anyone lend me a hand? You see i am trying to make a WYSIWYG editor but could do it.

My idea is to remove all tags the trying to do a copy-paste event except for the following

1. Bold
2. Italic
3. Underline
4. New lines such as <br> <p>

I think I saw this feature in some sites like wordpress and facebook.

If you have some reference please do share it. Thanks!

 

I recommend regular expressions if you want to extract or remove parts of text.

 

Hi you can try the following link :
http://stackoverflow.com/questions/2678264/how-to-make-an-html-js-wysiwyg-editor