I am sorry, but I can't get what you mean.
I tried the  HTMLStripCharFilter and PatternReplaceCharFilter. It doesn't
work.
Could you give me an example? Thanks! 

 <fieldType name="text_html" class="solr.TextField"
positionIncrementGap="100">
   <analyzer>
     <charFilter class="solr.HTMLStripCharFilterFactory"/>
     <tokenizer class="solr.WhitespaceTokenizerFactory"/>
   </analyzer>
 </fieldType>

I also tried:

<charFilter class="solr.PatternReplaceCharFilterFactory" pattern="([^a-z])"
replacement=""
                 maxBlockChars="10000" blockDelimiters="|"/>

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