Post show until specific keyword

Hi,

want my post to be shown on the index page and archive and so on until a specific keyword keyword. For example i have the following post and then i want it to be shown on the homepage until [stop] and the complete post when you click on it.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent dictum ipsum eu diam molestie tempus. Nunc eu venenatis lectus. Mauris tortor justo, accumsan a accumsan sit amet, pharetra ac metus. Vivamus faucibus consectetur massa, non interdum ligula eleifend vel. Donec eu lorem eget nulla pellentesque ultricies. [stop]

Duis diam diam, semper eu fringilla quis, imperdiet ut purus. In hac habitasse platea dictumst. Donec lacinia massa rhoncus tellus viverra a convallis arcu elementum. Etiam viverra enim non lorem laoreet dignissim eget eget felis. Vestibulum pretium, erat nec blandit posuere.

Nisi tortor mollis neque, quis venenatis neque dui porttitor orci. Integer vel risus augue. Maecenas eu nisi enim, at tristique nisi. Phasellus at erat in massa mattis iaculis.

Is there a plugin for this or can i do it another way?

thanks already