code: package com.nenovinite.news.features.filters;
  
  import java.io.IOException;
  
  import org.apache.commons.lang3.math.NumberUtils;
  import org.apache.lucene.analysis.TokenStream;
  import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
  import org.apache.lucene.analysis.util.FilteringTokenFilter;
  
  public class NumberFilter extends FilteringTokenFilter {
  	private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
  
  	/**
  	 * Create a new NumberFilter, that removes numbers from tokens
  	 * 
  	 * @param in
  	 *            TokenStream to filter
  	 */
  	public NumberFilter(TokenStream in) {
  		super(in);
  	}
  
  	@Override
  	protected boolean accept() throws IOException {
  		return !NumberUtils.isNumber(termAtt.toString().replace(",", "."));
  	}
  
  }
  