If you have a general support-related question, please feel free to post it here.
If you run into a bug and are familiar with GitHub, please consider filing a bug report, instead. The entry form on GitHub takes care of a lot of the troubleshooting groundwork, so it really makes it a lot easier for me to reproduce bugs and fix them.
It offers some convenience features that makes it easy to add and replace field content without needing to whip out regular expressions. But yeah, as @suiyuan mentioned, there’s more info in the add-on description on AnkiWeb. I might add more of an intro to these support threads in the future, but currently short on time.
How does the “add after” and “add before” functionality work? I also keep getting the message “target undo op not found”, even when I try to use the replace function