Using raw parameter value in file content replacer without escaping value

Hi there,

I've been using teamcity for a while now, but have only recently starting using its file content replacer build feature. Due to this, we have places where we use a parameter via an MSBuild command $(LogsTargetDirectory) and other places where we've just started using the file content replacer.

I'm finding it works really well, but I'm occasionally having issues when my parameter value contains a special character ($ or \). This is because the replace with field requires those character to be escaped with a backslash even when added via a parameter. I'm aware there is a REGEX_MIXED mode available to me, but I don't believe this gets me what I want either.

What I'm trying to achieve is a replacement value for this line in a web.config:

xml...
<aspNetCore processPath="bin\IISSupport\VSIISExeLauncher.exe" arguments="-argFile IISExeLauncherArgs.txt" stdoutLogEnabled="true" stdoutLogFile="<PARAMETER VALUE HERE>">
...xml

At the moment, my settings are:

LogsTargetDirectory param val: C:\application\Logs\
Find what: ([\s\S]*<configuration[\s\S]*<location[\s\S]*<system.webServer[\s\S]*<aspNetCore.*stdoutLogFile=")\S*("[\s\S]*)
Replace with: $1%system.LogsTargetDirectory%stdout$2

However, what I end up with is (no slashes):
<aspNetCore processPath="bin\IISSupport\VSIISExeLauncher.exe" arguments="-argFile IISExeLauncherArgs.txt" stdoutLogEnabled="true" stdoutLogFile="C:applicationLogsstdout">

After my attempts from this stackoverflow post:

• I don't believe REGEX_MIXED mode will allow the $1 and $2 capturing groups?
• Since I'm also using this parameter value for an MSBuild config I don't think I can pre-escape the value either.

What I'd like is to be able to use a syntax similar to %system.LogsTargetDirectory|raw% to ensure my actual value is used, but I don't think this is possible. Can anyone help me out?