anchor.diff:  `hl.formatter`::
   Selects a formatter for the highlighted output. Currently the only legal value is `simple`, which surrounds a highlighted term with a customizable pre- and post-text snippet.
   
  -`hl.simple.prehl.simple.post`::
  -Specifies the text that should appear before (`hl.simple.pre`) and after (`hl.simple.post`) a highlighted term, when using the simple formatter. The default is `<em>` and `</em>`.
  +`hl.simple.pre`, `hl.simple.post`::
  +Specifies the text that should appear before (`hl.simple.pre`) and after (`hl.simple.post`) a highlighted term, when using the `simple` formatter. The default is `<em>` and `</em>`.
   
   `hl.fragmenter`::
   Specifies a text snippet generator for highlighted text. The standard (default) fragmenter is `gap`, which creates fixed-sized fragments with gaps for multi-valued fields.
   +
   Another option is `regex`, which tries to create fragments that resemble a specified regular expression.
   
  -`hl.regex.slop`:: 0.6 |
  +`hl.regex.slop`::
   When using the regex fragmenter (`hl.fragmenter=regex`), this parameter defines the factor by which the fragmenter can stray from the ideal fragment size (given by `hl.fragsize`) to accommodate a regular expression.
   +
   For instance, a slop of `0.2` with `hl.fragsize=100` should yield fragments between 80 and 120 characters in length. It is usually good to provide a slightly smaller `hl.fragsize` value when using the regex fragmenter.
  
positive.code: `hl.regex.pattern`::
  Specifies the regular expression for fragmenting. This could be used to extract sentences.
  
  `hl.regex.maxAnalyzedChars`:: 10000 |
  Instructs Solr to analyze only this many characters from a field when using the regex fragmenter (after which, the fragmenter produces fixed-sized fragments). The default is `10000`.
  +
  Note, applying a complicated regex to a huge field is computationally expensive.
  
negative.code: 
  ==== The simple Boundary Scanner
  
  The `simple` boundary scanner scans term boundaries for a specified maximum character value (`hl.bs.maxScan`) and for common delimiters such as punctuation marks (`hl.bs.chars`). To implement the `simple` boundary scanner, add this code to the `highlighting` section of your `solrconfig.xml` file, adjusting the values as appropriate to your application:
  
  [source,xml]
  ----
  <boundaryScanner name="simple" class="solr.highlight.SimpleBoundaryScanner" default="true">
     <lst name="defaults">
       <str name="hl.bs.maxScan">10</str>
       <str name="hl.bs.chars">.,!?\t\n</str>
     </lst>
  </boundaryScanner>
  ----
  