Use
Find what: (\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}\b)|.
Replace with: $1
Extract email address from string using Notepad++ with regex
E
Use
Find what: (\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}\b)|.
Replace with: $1