/// <param name="keywords">Keywords that you want to remove from the response.</param>
/// <param name="redundancyLength">The extra length when searching for the keyword. For example, if your only keyword is "highlight",
/// maybe the token you get is "\r\nhighligt". In this condition, if redundancyLength=0, the token cannot be successfully matched because the length of "\r\nhighligt" (10)
/// has already exceeded the maximum length of the keywords (8). On the contrary, setting redundancyLengyh >= 2 leads to successful match.
/// The larger the redundancyLength is, the lower the processing speed. But as an experience, it won't introduce too much performance impact when redundancyLength <= 5 </param>
/// has already exceeded the maximum length of the keywords (8). On the contrary, setting redundancyLengyh >= 2 leads to successful match.
/// The larger the redundancyLength is, the lower the processing speed. But as an experience, it won't introduce too much performance impact when redundancyLength <= 5 </param>
/// <param name="removeAllMatchedTokens">If set to true, when getting a matched keyword, all the related tokens will be removed. Otherwise only the part of keyword will be removed.</param>
public KeywordTextOutputStreamTransform(IEnumerable<string> keywords, int redundancyLength = 3, bool removeAllMatchedTokens = false)