(PECL solr >= 0.9.2)
SolrQuery::getHighlightRegexPattern — Returns the regular expression for fragmenting
public SolrQuery::getHighlightRegexPattern ( ) : string
Returns the regular expression used for fragmenting
This function has no parameters.
 Returns a string on success and null if not set. 
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    https://www.php.net/manual/en/solrquery.gethighlightregexpattern.php