Extract shortcodes from posts/pages

Hey,

I’m busy with a WordPress plugin. I want to extract (and return) a specific shortcodes from all posts and pages, but almost everything I try, gives me a memory limit exceeded-error… So, I wonder if anyone of you have a similar plugin, and what method you are using. I tried it with removing and adding the specific shortcodes, trying to catch up with the return values, but that refuses to work…

Thanks,

Jannick