Regular Expressions 101

Explanation

Pro

^start of line

Group 1(\w+)

\w+any word character, repeated at least once

\sany whitespace character

Group 2(\1)

\1the text saved by group 1

Positive Lookahead(?=\s)

\sany whitespace character

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

25 tokens

^(\w+)\s(\1)(?=\s)

New

Words Words are the same
correct words used
Same words used and Words are the same
Same words used and Words are the same Same

Words Words are the same
correct words used
Same words used and Words are the same
Same words used and Words are the same Same