Tip 75: Use Parentheses to Capture Submatches

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regex matching duplicate words:

/\v<(\w+)\_s+\1>

• \0 always refers to the entire match
• \_s: matches whitespaces or a line break

References:

# If you open the file in vim,
# then you can \"ayy@a the next line to execute the vim command: 
:h /\_

# If you open the file in vim,
# then you can \"ayy@a the next line to execute the vim command: 
:h 27.8