How to find unused words in a wordlist from a dictionary using notepad++

I want to find words in notepad++ that are not used in any files. Suppose i have a dictionary and a book. I want to find words from the dictionary that are not present in books. How can i do this? Thanks.

Solution

As suggested by Toto, Notepad++ is not the job for this. That being said, it is not impossible in Notepad++. Here is how to do it with Shakespeare's sonnet 24:

Mine eye hath play'd the painter and hath stell'd
Thy beauty's form in table of my heart;
My body is the frame wherein 'tis held,
And perspective it is the painter's art.
For through the painter must you see his skill,
To find where your true image pictured lies;
Which in my bosom's shop is hanging still,
That hath his windows glazed with thine eyes.
Now see what good turns eyes for eyes have done:
Mine eyes have drawn thy shape, and thine for me
Are windows to my breast, where-through the sun
Delights to peep, to gaze therein on thee;
Yet eyes this cunning want to grace their art;
They draw but what they see, know not the heart.

Format your book so that it consists of one word per line. Start by going to Search->Replace and typing \b([A-Za-z']+)\b into the Find what: field and \1\n into the Replace with: field. Then ensure the Regular expression radio box is checked and press Replace All. This gives us

Mine
 eye
 hath
 play'd
 the
...
 they
 see
, know
 not
 the
 heart
.

Remove all punctuation from the document by putting [ .,;:] into the Find what and making sure the Replace with is empty:

Mine
eye
hath
play'd
the
...
grace
their
art

They
draw
but
what
they
see
know
not
the
heart

Now copy your dictionary (which I hope is in the form of one word per line) above the text. I will just use an example dictionary containing the words painter, aeroplane, camel, shape, done. Mark the end of the dictionary with something unique so that you can find it later. You should now have

painter
aeroplane
camel
shape
done
----ENDOFDICTIONARY---


Mine
eye
hath
play'd
...
the
heart

Make everything lowercase by pressing Ctrl-A to select everything and then pressing Ctrl-U
Open the Replace dialog and put ^(.*?)$\s+?^(?=.*^\1$) (cf this answer) into Find what and leave Replace with empty. Ensure the . matches newline checkbox (next to the Regular Expression radio box) is checked. Now press Replace All and all the words in the dictionary list which appear in the book will be removed:

aeroplane
camel
----ENDOFDICTIONARY---
eye
play'd
stell'd
beauty's
...

The words above ---ENDOFDICTIONARY--- will be those which appear nowhere in the text.