Sample normalize

[Smith Norton]

In the regex-normalize.xml the following code is present.

<regex>
  
<pattern>(\?|\&amp;|\&amp;amp;)PHPSESSID=[a-zA-Z0-9]{32}(\&amp;|\&amp;amp;)(.*)</pattern>
  <substitution>$1$3</substitution>
</regex>
</regex-normalize>

Could anyone please explain me with an example, what type of URL it is
normalizing to what?