Regex repeated words on the same line

Question

What is the regular expression to find words that are repeated on the same line? I've tried some expressions that I found on Stack Overflow, such as this, but none is working correctly. The result I want to achieve:

Accepted Answer

This regex will do to find which words you want to highlight. (The example is in JavaScript, and it is easy to test in the browser's JavaScript console.) ``` s = "It's a foo and a bar and a bar and a foo too."; a = s.match(/\b(\w+)\b(?=.*\b\1\b)/g); ``` This returns an array of words, possibly multiple times for the same word. Next you can do this: ``` re = new RegExp('\b(' + a.join('|') + ')\b', 'g'); ``` And that should suffice to highlight all occurrences: ``` out = s.replace(re, function(m) { return '' + m + '' }); ```

Regex repeated words on the same line

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