Bulk Docs Find & Replace add-on for Google Docs revolutionizes your experience by saving your time to search multiple Google Docs/Microsoft Word files and batch replace lines of text. Also lets you to extend your search by using regular expressions to find words or phrases that contain specific characters or combinations of characters.

Limitations: Free version lets you to find and replace in single file without folder selection(s) support.

Features:
- Find and replace with a list of regular expressions
- Toggle to use case sensitive searches
- Support for multiple selection of files or folders
- Ability to replace header and footer text

Video link: https://youtu.be/Jr_KFH17dV0