Regular Expression For Duplicate Words

Question

I\'m a regular expression newbie, and I can\'t quite figure out how to write a single regular expression that would "match" any duplicate consecutive words such as

Answer 1

The example in Javascript: The Good Parts can be adapted to do this:

var doubled_words = /([A-Za-z\u00C0-\u1FFF\u2800-\uFFFD]+)\s+\1(?:\s|$)/gi;

\b uses \w for word boundaries, where \w is equivalent to [0-9A-Z_a-z]. If you don't mind that limitation, the accepted answer is fine.