Conditional replace depending on which character is found

Question

This is NOT a duplicate of How to use conditionals when replacing in Notepad++ via regex as I am asking something very specific here which I cannot implement following the info in that question. So kindly allow this question.

I want to replace a range of characters with a corresponding range of characters. So far, I can only do it with multiple operations.

For example, match any word that starts with a capital Latin character in the range [ABEZHIKMNOPTYXZ] and is followed by a Greek lowercase letter [α-ωά-ώ] and replace the character in the first matched group with a similar-looking character but in the Greek range [ΑΒΕΖΗΙΚΜΝΟΡΤΥΧΖ] (note, they look the same but are different characters).

What I came up so far was multiple replacements, ie.

(A)([α-ωά-ώ])
Α\2

(B)([α-ωά-ώ])
Β\2

....

So that for example: Aνθρώπινος would become Ανθρώπινος

Bάτος would become Βάτος

Preferably this should work in EmEditor, Notepad++ being the 2nd option.

Answer 1

Notepad++ supports conditional replacement, you can use it like:

• Find what: (?:(A)|(B)|(E)|(Z)|(H)|(I)|(K)|(M)|(N)|(O)|(P)|(T)|(Y)|(X)|(Z))(?=[α-ωά-ώ])
• Replace with: (?{1}Α:(?{2}Β:(?{3}Ε:(?{4}Ζ:)))) add the other Greek letters similarly

Replacement:

(?:             # start non capture group
(?{1}           # if group 1 exists "A"
  Α             # replace with greek letter
  :             # else
  (?{2}         # if group 2 exists "B"
    Β           # replace with greek letter
    :           # else
    (?{3}       # and so on ...
      Ε
      :
      (?{4}
        Ζ
        :
      )
    )
  )
)
)               # end non capture group
(?=             # positive lookahead, make sure we have after:
    [α-ωά-ώ]    # a small greek letter
)               # end lookahead

---

I've made a test but for only for 2 letters "A" and "B" and replace them with more visual different letters "X" and "Y" just to show the way it works.

Screen capture (before):

Screen capture (after):