Regular expression to find and remove duplicate words

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As said by others, you need more than a regex to keep track of words:

var words = new HashSet<string>();
string text = "I like the environment. The environment is good.";
text = Regex.Replace(text, "\\w+", m =>
                     words.Add(m.Value.ToUpperInvariant())
                         ? m.Value
                         : String.Empty);

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