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Add comma to numbers at every three digits in Notepad++

Adding a comma as a delimiter at every three digits in integers, consisting of consecutive digits in Notepad++ editor:

  1. Ctrl + H
  2. Find What: (\d)(?=(\d\d\d)+(?!\d))
  3. Replace With: \1,
  4. Wrap around
  5. Search Mode: Regular expression
  6. Replace All

"Replace" dialogue in Notepad++

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