Clone this repo to wherever is most convenient. Then, symlink the scripts/ folder to a .minecraft/saves/my-world/scripts/ folder in all of the minecraft worlds you want to use them in.
re.sc allows you to use the /re command to search your environment using Regex. Currently, the only available mode is /re b <pattern>, which allows you to regex search through nearby blocks. Here is a list of modes I plan to add in the future:
/re i <pattern> for searching for matching items in nearby containers
/re t <pattern> for searching through nearby text such as signs, renamed items in item frames, and renamed shulker boxes