How to find number of style classes defined in a CSS file

How do you find number of style classes defined in a CSS file? I need to clean my stylesheet. 开发者_StackOverflowPlease tell me of any good clean-up solutions.

I just tried to get count of '{', worked

Try Dust-me, a Firefox add-one. It shows you all unused CSS selectors. https://addons.mozilla.org/en-us/firefox/addon/dust-me-selectors/