QTextBrowser does not open links and clears window when link is selected

QTextBrowser *searchHelp = new QTextBrowser; 
QString systemInfo; 
QTextStream str(&systemInfo); 
str << "<p>Search file names for specific text.&nbsp; <a href=\"https://perldoc.perl.org/perlre#DESCRIPTION\">Regular Expressions</a> are " "supported.&nbsp;&nbsp;</p>"; 
searchHelp->setOpenLinks(true); 
searchHelp->setHtml(systemInfo); 
searchHelp->show();