I use TSE (The Semware Editor) or Notetab Lite mostly. I may use Excel for certain editing functions. TSE has a macro language and "regular expression" search, find, and replace. It's fast and handles very large files.
There are probabably better ones available, but I have been using these for a long time (TSE ver 2.5 from 1995) and I am familiar with them. TSE works in a command window with a DOS interface. I should order and upgrade if it's still for sale
EditPad Lite is free for non-commercial use. That is, you may use EditPad Lite if you do not get paid, directly or indirectly, for the work you do with EditPad Lite. Registered charities may also use EditPad Lite. If you want more editing power or need a text editor to use at work, check out EditPad Pro.
I love editpad lite, however, I did not like it when they did some of the upgrades, so I still use one of the older versions. I'll try to come back and note which one in the near future.
If you have no experience with this very good program, then you can come to love it as is, but I love it as was, so I've stayed with it.