Use a backreference

bash

rg -P '\b(\w+)\s+\1\b' notes.txt

Explanation

Backreferences are not supported by the default regex engine, so `-P` is required.

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

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Turn on advanced regex features such as look-around.

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Allow regexes to match newlines.

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Match text spanning lines using a more powerful regex engine.

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Search for either of two words.

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