how to filter numeric values?

[juniol]

hello;

i want to filter my tokens and keep only string tokens ( remove numbers
ect).
i sue this :

public TokenStream tokenStream(String fieldName, Reader reader) {
    return new PorterStemFilter(
      new StopFilter(
        new LowerCaseFilter(
          new StandardFilter(
            new StandardTokenizer(reader))), stopset));
  }
  


thanks

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