Regular expression to highlight duplicate words in a string

Posted by murugaperumal on Stack Overflow See other posts from Stack Overflow or by murugaperumal
Published on 2010-03-24T03:51:55Z Indexed on 2010/03/24 4:23 UTC
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perl

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regex

I want a Perl regular expression that will match duplicated words in a string.

Given the following input:

$str = "Thus joyful Troy Troy maintained the the watch of night..."

I would like the following output:

Thus joyful [Troy Troy] maintained [the the] watch of night...

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