public static String extractKeywords(String url){
  if (StringUtils.isEmpty(url)) {
    return null;
  }
  for (  KeywordMatcher matcher : SEARCH_ENGINES) {
    String keywords=matcher.matchKeywords(url);
    if (keywords != null) {
      return keywords.replace("+"," ");
    }
  }
  return null;
}

public static String extractKeywords ( String url ) { if ( StringUtils . isEmpty ( url ) ) { return null ; } for ( KeywordMatcher matcher : SEARCH_ENGINES ) { String keywords = matcher . matchKeywords ( url ) ; if ( keywords != null ) { return keywords . replace ( "+" , " " ) ; } } return null ; }
extracts keywords from url if possible .
