Ch. 06 schema.xml includes solr.PatternReplaceCharFilterFactory which breaks Tokenizer

[nycjv321]

I've noticed that if I use the provided PatternReplaceCharFilterFactory config in chapter 6, then input strings aren't properly tokenized.

For example:

<!-- other config -->
<fieldType name="text_microblog" class="solr.TextField" positionIncrementGap="100">
  <analyzer type="index">
    <charFilter class="solr.PatternReplaceCharFilterFactory"
                pattern="([a-zA-Z])\1+"
                replacement="$1$1"/>
    <tokenizer class="solr.WhitespaceTokenizerFactory"/>

    <filter class="solr.WordDelimiterFilterFactory" 
    <!-- other config -->

with the request: http://localhost:8983/solr/#/example_collection/analysis?analysis.fieldvalue=1%202&analysis.fieldtype=text_microblog&verbose_output=1. In the response, SOLR does not properly tokenize the string "1 2" to a collection of characters "1" and "2". This is not how it is described in the book.

If I remove the PatternReplaceCharFilterFactory like so:

<!-- other config -->
<fieldType name="text_microblog" class="solr.TextField" positionIncrementGap="100">
  <analyzer type="index">
    <tokenizer class="solr.WhitespaceTokenizerFactory"/>

    <filter class="solr.WordDelimiterFilterFactory" 
    <!-- other config -->

and reboot the SOLR instance, the query above produces the correct response where the string "1 2" is properly recognized as two characters "1" and "2".

Is this expected?