Notepad++ how to extract only 1, 2, 3, 4 or 5 character capital lettered Words only in a document?

Solution 1:

• Ctrl+H
• Find what: ^([A-Z]{1,5})$|^.*\R?
• Replace with: $1
• CHECK Match case
• CHECK Wrap around
• CHECK Regular expression
• UNCHECK . matches newline
• Replace all

Explanation:

^               # beginning of line
    (               # start group 1
        [A-Z]{1,5}      # 1 up to 5 capital letters
    )               # end group
$               # end of line
  |               # OR
^               # beginning of line
    .*              # 0 or more any character but linebreak
    \R?             # any kind of linebreak (i.e. \r, \n, \r\n), optional

Replacement:

$1              # content of group 1, the capital letters

Screenshot (before):

Screenshot (after):