Check which numbers are not included

  • Hello all together,

    I need to go through a list and check which numbers are not included.


    The number 2 is missing so the output should be 2

    As the list I have has around 9k missing numbers this would take to much time to do it manually.

    Is there a plugin I can use to make this easier?

    Thanks and greetings from Germany!

  • @Miko-Merz

    Notepad++ isn’t going to be able to directly help you with that. You need a programming language. Of course you can use one of Notepad++'s scripting languages to do it on the contents of the current editor buffer, or a standalone language using your disk file as input works well, too. Good luck.

  • Hello @miko-merz and All,

    I think that I found out a way to do it…, from within Notepad++, but, first, I would like some details on your real text :

    • From the list, below :

    Do you expect the following results ?

    • Or, may be, you just need a complete list of consecutive numbers, between two boundaries n1 and n2 ?

    So, a short extract of, both, your original text and the final text expected, would be welcome !

    See you later,

    Best Regards,


  • I’m not exactly sure where @guy038 is heading, but his reply made me rethink my original nay-saying answer.

    Here’s something you might try:

    • Create a new editor tab window in Notepad++

    • Use the Edit (menu) -> Column Editor… -> Number to Insert feature to create a column of numbers that completely covers your range of interest into the new editor tab

    • Add a line of 8 dashes at the bottom of this complete number list: --------

    • Copy your real dataset (the one with the missing numbers) into the new tab BELOW the line of dashes

    • Run the following redmarking/bookmarking operation:

    Invoke Mark dialog (Search (menu) -> Mark…) <–Suggestion: Tie ctrl+m to this action
    Find what zone: (?s)^(\d+)$(?=.*?-{8}.*?^\1$)
    Mark line checkbox: ticked
    Purge for each search checkbox: ticked (not strictly necessary but good if you are experimenting…)
    Wrap around checkbox: ticked
    Search mode selection: Regular expression
    Action: Press Find All button

    At this point you should see in the complete list – from the top of the file to the line of dashes – the numbers that are missing from your real dataset remain un-redmarked and on lines that are not bookmarked, and you can do with them what you will from that point…

    So, taking @guy038’s list and running the above on it, I obtained the following:


    [Ignore the orange and green blobs in the margin, and your bookmarking symbol will be a blue circle instead of my cool-looking real bookmark symbol.]

    If this is just a one-time or an occasional need, this technique could satisfy it.

  • @Scott-Sumner, @guy038 etc.

    When I saw the OP I thought it should be a fairly simple regex, once the file was configured with a FULL number list above, a delimiter and the area below to compare too, but then this:

    @Miko-Merz said:

    As the list I have has around 9k missing numbers this would take to much time to do it manually.

    got me concerned. We are potentially talking about creating a number sequence list running possibly into the millions. I looked online and one website will make lists for free, however their list can only number 10000 consecutive numbers. With 9000 numbers possibly missing I couldn’t see an easy way to generate the full list to start with. It seemed like cracking a walnut with a 10lb sledgehammer.

    I think my regex was almost verbatim to Scott’s one. I guess we’ll have to see if Guy can pull another white rabbit out of the hat.

    Would NOT a python script or similar do it very easily? It would only need start and end numbers, add 1 each time and test, print the answer if not found! I guess I need to broaden my horizons.


  • @Terry-R

    I guess I missed the “9k” thing in the OP, but in the best case this could mean only 18000 numbers. :-)

    It is always kind of iffy to offer up a regex solution when you don’t know if the user is talking about a “big data” situation. We’ve seen problems with this before here on the Community and I believe this kind of thing can happen when the data gets “too big”.

    A script could do it, as I originally said, but I’m not writing one. I typically only do that when it can be of some use to me as well…sorry for my selfish attitude. :-) I guess I played around with the regex not because it would be useful to me, but just to see if it could be done.

  • Off Topic Answer:

    1. install Strawberry Perl

    2. Save the file below as

    3. perl FILENAME

      • or give it no filename, and paste the data to STDIN: perl
      • or also give it output redirection: perl INFILE > OUTFILE

      use warnings;
      use strict;

      my $max = 0;
      my %n;
      while(<>) {
      $max = $_ if $_ > $max;
      my @missing = grep { !exists $n{$
      } } 1 … $max;
      print join “\n”, @missing;

  • @PeterJones

    Curious where the 16392 came from? :-)

  • Hi, @miko-merz @scott-sumner, @peterjones and All,

    Bngo, Scott ;-)) Indeed, I was thinking to something very similar !

    So, Nico, let’s suppose that your numbers are all, in the range [300....700]

    • Open a new tab, in N++ ( Ctrl + N )

    • Hit the Enter key to create a first line-break

    • Open the Replace dialog ( Ctrl + H )

      • SEARCH \R

      • REPLACE \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n

      • Tick the Wrap around option

      • Select the Regular expression search mode

      • Click 3 times on the Replace All button => You should get 1000 ( = 10^3 ) pure blank lines

      • Hit the Esc key to close the Replace dialog

    • Now, open the Column editor ( Alt + C )

      • Select the option Number to Insert

      • Type in 300 as the Initial number

      • Type in 1 , in the Increase by field

      • Leave the options Repeat and Leading zeros empty

      • The format is decimal, by default

      • Click on the OK button

    • Then, remove all blank characters at end of lines ( Edit > Blank Operations > Trim Trailing Space )

    • Open the Go To dialog

      • Type in 400 ( 700-300 )

      • Hit the Enter key=> Cursor is on line 699 !

    • Place your cursor at beginning of line 701

    • Select all lines till the end of file ( Ctrl + Shift + End ) and delete them

    At this point, we have a 401-lines file, numbered from 300 to 700

    • Now, add a separation line of, at least, 3 dashes ---

    • Finally, and it’s the main point, UNDER the dashes line, add your OWN list of numbers ( where some numbers are absent ! )

    • Open, again, the Replace dialog ( Ctrl + H )

      • SEARCH (?s)(^\d+\R)(?=.*---.*^\1)|---.*

      • REPLACE Leave EMPTY

      • Tick the Wrap around option

      • Select the Regular expression search mode

      • Click, ONCE, on the Replace All button

    => You should obtain, only, the short list of integers, between 300 and 700, which are absent from your original list ;-))

    Remark : In order to test my regex, I, simply, copy the consecutive list of numbers, under the --- and deleted some numbers ( for example : 302 , 361 , 426 , 491 , 653 )



  • @Scott-Sumner,

    That’s easy: from the URL.

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