Regex in java for finding duplicate consecutive words

Question

I saw this as an answer for finding repeated words in a string. But when I use it, it thinks This and is are the same and deletes the is

Answer 1

\b(\w+)(\b\W+\1\b)*

Explanation:

\b : Any word boundary 
(\w+) : Select any word character (letter, number, underscore)

Once all the words are selected, now it's time to select the common words.

( : Grouping starts

\b : Any word boundary

\W+ : Any non-word character

\1 : Select repeated words

\b : Un select if it repeated word is joined with another word

) : Grouping ends

Reference : Example