Nice.

That works well for zero/oh, but not one/ell:

Whereas doing the operators as lowercase a-z will hjelp with one/ell but not zero/oh:

Another idea for a quick check is to just temporarily mark (Search > Mark) all the digits, which would distinguish all the 1s and 0s, so if it’s not higlighted, it would be a lowercase letter l (ell) or uppercase letter O (oh)

It is very hard to make difference between lowercase L, uppercase i and number 1. The O and 0 also are sometimes is a problem.

You might just choose a font. For example, Courier New is pretty bad:

Whereas DejaVu Sans Mono differentiates better:

I am in my eight X and my eyes not so good as earlier.

Notepad++ has zoom (View => Zoom), and you can set your default font to a larger size and / or one that has better differences between the letters you mentioned:

Cheers.

Sorry, that is not natively possible. The syntax highlighters (“lexers”) that are built in don’t have a rule like that, and the User Defined Language (UDL) can allow you to define your own syntax for a list of keywords, but that doesn’t have the feature of just looking at the case of the letters in your text (though it could handle the numbers=green portion of your request)

You can add extra highlighting to a lexer using regexes via the script EnhanceAnyLexer.py that @Ekopalypse shares in his github repo … but I have a feeling if the Style Configurator is too complicated for you, using the PythonScript plugin to setup EnhanceAnyLexer might also be too difficult.

If you’d like to try that, let us know, and we can try to guide you down the path… but you have to be willing to put in the effort.

Also, before we’d start, we’d want a bit more detail:

• is this a 1-time need, or something you will need many times in the future?
• do you need it “on-the-fly” (so as you type, it automatically updates the coloring)? or would “on demand” be sufficient (so you do some edits, then hit a keystroke or run a menu option and the colors get updated"
• Is this always in a file with the same extension (like .clr or .xyz)? Or is it just on some files that end in .txt but not others?
• What about text with mixed case, or mix of numbers and letters, like below

  UPPERCASE
  lowercase
  MixedCase
  Standalone Numbers: 1234
  Text1With2Numbers3Embedded4
  

  Is it really every uppercase letter (like the M and C in MixedCase), or just whole words that are uppercase (like UPPERCASE)

Maybe you could do it by defining a UDL (User Defined Language). Not sure about that, though as I’m not strong in knowing about that.

I’d say that for sure you could do it with “EnhanceAnyLexer”.
This is something called a script that would require you to set up and use the PythonScript plugin.

It works by coloring per a “regular expression” specification.

Base regular expressions for what you are interested in are:

• \u : uppercase
• \l : lowercase
• \d : digit

I’m sure the author of “EnhanceAnyLexer”, @Ekopalypse , will come along to tell you more about it.

“EnhanceAnyLexer” is found here: https://github.com/Ekopalypse/NppPythonScripts/blob/master/npp/EnhanceAnyLexer.py