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xml - Powershell regex for replacing text between two strings

I am trying to use a powershell script to change the password between two strings, I am running into two issues.

  1. A complex password seems to break my regex, If I use something as simple as "TestPassword" the regex does what I expect. However using a more complex password "6QAfD5PmMhWzUxTq1FO1bGJQQXRXu6tizN29h6MRUSI=" it breaks and results in
SSLEnabled="true" keystoreFile="C:cert.pfx" $16QAfD5PmMhWzUxTq1FO1bGJQQXRXu6tizN29h6MRUSI=" keystoreType="PKCS12"/>

instead of

SSLEnabled="true" keystoreFile="C:cert.pfx" keystorePass="6QAfD5PmMhWzUxTq1FO1bGJQQXRXu6tizN29h6MRUSI=" keystoreType="PKCS12"/>
  1. I want to be less specific for the second match grouo, for example at the moment I must specify '" keystoreType' but I would prefer to be less specific and only specify the ending quote. This way if I change the position of the keystoreType parameter in the future I don't have to worry about changing the regex to suit.

Bellow is my powershell as it stands:

#Set new password in server.xml
$pass='6QAfD5PmMhWzUxTq1FO1bGJQQXRXu6tizN29h6MRUSI='
$server_xml=".server.xml"
(Get-Content $server_xml) -replace '(keystorePass=")(.*)(" keystoreType)',('$1{0}$3' -f "$pass") | Set-Content $server_xml

Bellow is an extract from my xml:

<Connector port="443" relaxedPathChars="[]|" relaxedQueryChars="[]|{}^&#x5c;&#x60;&quot;&lt;&gt;"
                   maxThreads="150" minSpareThreads="25" connectionTimeout="20000" enableLookups="false"
                   maxHttpHeaderSize="8192" protocol="HTTP/1.1" useBodyEncodingForURI="true" redirectPort="8443"
                   acceptCount="100" disableUploadTimeout="true" bindOnInit="false" secure="true" scheme="https"
                   proxyName="test.example.com" proxyPort="443"
                   SSLEnabled="true" keystoreFile="C:cert.pfx" keystorePass="123abc" keystoreType="PKCS12"/>
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This person had a similar issue that I was able to use the regex in my code:

Hide passwords in string

I ended up with the following:

#Set new password in server.xml
$pass='6QAfD5PmMhWzUxTq1FO1bGJQQXRXu6tizN29h6MRUSI='
$server_xml=".server.xml"
(Get-Content $server_xml) -replace '(?:(?<=keystorePass=")S+(?="))',("$pass") | Set-Content $server_xml

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