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1132.Advanced search and replace -- How to find missing numbers from a list of numbers?

User: liping -- 2013-09-13          << 1131  1133 >>
Hits: 1476
Type: Advanced search and replace   
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Find missing numbers

File (a.txt) is 15000-40000 such order, in the middle a little something figures, such as less 16321,27770,32022, etc., I now want to find out these numbers (b.txt).

My current approach is
1: Generate file c.txt "15000-40000" all the numbers.
2: c.txt - a.txt = b.txt

I would like to know if there was a better way. Thank you

Input Sample:
(missing 1233, 1357)
Output Sample:
Hint: You need to Download and install "Replace Pioneer" on windows platform to finish following steps.
1. ctrl-o open text file
2. ctrl-h open 'replace' dialogue
* set 'replace with pattern' to:

3. click 'replace', done.
4. ctrl-s save to file

Screenshot 1:  Replace_Window

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Check Demo of Advanced search and replace
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