How to Remove UNIQUE lines only (opposite of remove duplicates) in VS Code with simple `cmd+f` & REGEX

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How to Remove UNIQUE lines only (opposite of remove duplicates) in VS Code with simple `cmd+f` & REGEX	vs code productivity

How to Remove UNIQUE lines only (opposite of remove duplicates) in VS Code with simple cmd+f & REGEX

1. Use cmd+f to open the 'Find' dialog box
2. Click the button to 'Use Regular Expression', it looks like a .*
3. Enter this REGEX (below) into the box, and click "Replace All" (hotkey: cmd+enter)

^(.+)$(?=\n(?:.*\n)*?\1$)

You will now be left with only the lines that were UNIQUE in the file (aka all of the items that had duplicates were removed, including the originals)