How to convert in Notepad++ using regular expressions?

Question

How to convert Ctrl+(any letter) to «Ctrl+(any letter)»?

I need like this:

Ctrl+T
Ctrl+D
etc.

Convert to:

«Ctrl+T»
«Ctrl+D»
etc.

I tried replacing this (Ctrl\+.) with (Ctrl\+[a-zA-Z]), but the result is Ctrl+[a-zA-Z].

Answer 1

Find what:

(Ctrl\+[a-zA-Z])

Replace with:

«\1»

Make sure Search mode 'Regular expression' is selected.