Quick Search and Replace is capable of replacing, inserting or eliminating text as you indicate. And it can do so with multiple files at the same time, thus saving you a lot of work. Simply locate the documents and establish the rule that you want to apply. Quick Search and Replace will do the rest. The application supports any text document based on ASCII.
You will be able to search for documents by means of the access path or name masks, or locate the documents due to a sentence or word. All the operating that are foregone will have the possibility to be undone, and it even offers the possibility to create backups to avoid trouble.
Do you need to replace text in many documents? Download Quick Search and Replace, it may be the tool that you were looking for.