OneVike
(I might have mentioned these, before . . .)
On Mac OS, I suggest BBEdit / TextWrangler
http://www.barebones.com/products/bbedit/index.html
http://www.barebones.com/products/textwrangler
BareBones.com now says to use BBEdit instead of TextWrangler.
These BBEdit products include grep search and several regular expression tools (RegEx / RegExp).
- - -
On Windows OS, I suggest EditPad Lite / EditPad Pro
https://www.editpadlite.com/m/index.html
- by JustGreatSoftware:
https://www.just-great-software.com/m/index.html
I also use their PowerGREP and RegexBuddy
Thanks, I’ll check them out.