The filter name, "Capture Group", says it all - only pattern groups are captured and you have not specified even a single group. See the example: http://www.solr-start.com/javadoc/solr-lucene/org/apache/lucene/analysis/pattern/PatternCaptureGroupFilterFactory.html
Groups are each enclosed within parentheses, as shown in the Javadoc example above. Since no groups were found, the filter doc applied this rule: "If none of the patterns match, or if preserveOriginal is true, the original token will be preserved." http://www.solr-start.com/javadoc/solr-lucene/org/apache/lucene/analysis/pattern/PatternCaptureGroupTokenFilter.html That should probably also say "or if no pattern groups match". To test regular expressions, try an interactive online tool, such as: https://regex101.com/ -- Jack Krupansky On Sun, Mar 6, 2016 at 7:51 PM, Alexandre Rafalovitch <arafa...@gmail.com> wrote: > I don't see the brackets that mark the group you actually want to > capture. As per: > > http://www.solr-start.com/javadoc/solr-lucene/org/apache/lucene/analysis/pattern/PatternCaptureGroupTokenFilter.html > > I am also not sure if you actually need "{0,1}" part. > > Regards, > Alex. > ---- > Newsletter and resources for Solr beginners and intermediates: > http://www.solr-start.com/ > > > On 7 March 2016 at 04:25, Jay Potharaju <jspothar...@gmail.com> wrote: > > 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 >
