regex - Removing duplicate characters from pairs -

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I have a document in Notepad ++, where combinations of characters can be doubled in each line and I want them to be Should be single. For example: 

  ((AA11bb 88 ccc)) - & gt; (A1B8CC)

This is removing a duplicate character for each pair (2) characters.

Hope you can help.

<

Use capturing group and backference.

Find: 

  (.) \ 1

Replace with: 

  \ 1

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