Feature selection for illegitimate contents recognition

To describe a two-steps fearture selection method.Firstly,recognise all the special words from the training texts by fi-nite accepter and add it to the final feature set,recover the original text as well.Then select features from the processed texts and add them to the feature set by the way o'fconbination feature selection method'.The experiment result shows that it can im-prove the precision of the illegitimate contents recognition