Regular Expressions 101

Explanation

Pro

Group 1(\b\w+\b)

\ban ASCII word boundary

\w+any word character, repeated at least once

\ban ASCII word boundary

Negated Character Class[^\n]*?

*?matches any number of characters outside the set below:

\na line-feed (newline) character (ASCII 10)

\1the text saved by group 1

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

(\b\w+\b)[^\n]*?\1

New

test test  test  test
test ttestt  test  etestt
ttestt test 
ttestt tttesttt
1test2 1test2 1test2 21test21
tetst tetst tetst

test test  test  test
test ttestt  test  etestt
ttestt test 
ttestt tttesttt
1test2 1test2 1test2 21test21
tetst tetst tetst