What problem does the following code solve?

Why would this not work, and how could you rectify the problem?

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var myString = "This sentence has has a fault and and we need to fix it." var myRegExp = /(\b\w+\b) \1/g; myString = myString.replace(myRegExp, "$1"); Now imagine that you change that code, so that you create the RegExp object like this: var myRegExp = new RegExp("(\b\w+\b) \1");