Custom field using PatternCaptureGroupFilterFactory

[Jay Potharaju]

Hi,
I have a custom field for getting the first letter of an firstname. For
this I am using PatternCaptureGroupFilterFactory.
This is not working as expected, not able to parse the data and get the
first character for the string. Any suggestions on how to fix this?

 <fieldType class="solr.TextField" name="text_firstLetter">

      <analyzer>

        <tokenizer class="solr.KeywordTokenizerFactory"/>

        <filter class="solr.UpperCaseFilterFactory"/>

        <filter class="solr.PatternCaptureGroupFilterFactory" pattern=
"^[a-zA-Z0-9]{0,1}" preserve_original="false"/>

       </analyzer>

    </fieldType>

-- 
Thanks
Jay