BuddyPress.org

you asked this question yesterday (why not just keep it to one thread)
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/search-and-replace-status-text-with-regular-expressions/

you will need to use the hooks setup for buddypress or ask the author of that plugin to include the hooks. ie, the hook for the activity content is `bp_get_activity_content` or forums `bp_get_the_topic_post_content` and so forth.