How to remove lines that don't contain at least one uppercase letter, lowercase letter, number and special symbol in Notepad++

Question

After looking across the internet for about an hour, I decided to register an account and ask a question :)

I'd like to remove all lines that don't contain at least one uppercase letter, lowercase letter, number and special symbol [Examples of Special Symbols: !@#$%^&*()] in Notepad++

Example Input:

josukeisbig
JOSUKEISBIG
JosukeIsBig
JosukeIsB1g
JosukeIsB1g!

Example Output:

JosukeIsB1g!

The only related thread I found was this: How to remove lines that not containing any uppercase letters or lowercase letters or numbers notepad++

But OP didn't specify special characters.

• Thanks!

Answer 1

You can use the below regexp:

^(?!(^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[\!\@\#\$\%\^\&\*\(\)\]]).+$)).*$

In Notepad++ you can either search for this regexp, replace all with an empty string and then go to:

Edit >> Line Operations >> Remove Empty Lines

As an alternative to delete them, instead of using Find & Replace, you can use the Mark tab from the same window and mark all lines using the same regexp. To delete them, go to:

Search >> Bookmark >> Remove Bookmarked Lines

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A screenshot for convenience:

Answer 2

• Ctrl+F
• Select "Mark" tab
• Find what: ^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^\w\r\n]).+$
• CHECK Match case
• CHECK Wrap around
• CHECK Regular expression
• UNCHECK . matches newline
• CHECK Bookmark line
• Mark all

Explanation:

^                   #  beginning of line
  (?=.*[a-z])       # lookahead, make sure we have a lowercase
  (?=.*[A-Z])       # lookahead, make sure we have an uppercase
  (?=.*\d)          # lookahead, make sure we have a digit
  (?=.*[^\w\r\n])   # lookahead, make sure we have a non-word, non-linebreak
  .+                # 1 or more any character
$                   # end of line

Screenshot:

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Second step:

Menu => Search => Bookmark => Remove Unmarked Lines.   

Screenshot: