When you use double-quoted strings, you can expand variables inside of them like this:

PS C:\> "Windir: \$env:windir"
Windir: C:\Windows

However, there is no obvious way to mark the beginning and end of variables, so this will fail:

PS C:\> "\$env:windir: this is my Windows folder"
this is my Windows folder

The solution is to use braces to identify the start end end of variables inside strings:

PS C:\> "\${env:windir}: this is my Windows folder"
C:\Windows: this is my Windows folder

• Just spit-ball'in here:

Here are few more ways to do this. As the prblem here is not dealing the *** in this string, since there is no variable called
\$env:windir:

Using backtick
"\$env:windir`: this is my Windows folder"
C:\WINDOWS: this is my Windows folder

Using a space
"\$env:windir : this is my Windows folder"
C:\WINDOWS : this is my Windows folder

Using parens
"\$(\$env:windir): this is my Windows folder"
C:\WINDOWS: this is my Windows folder

You could also do these. Though I am not real sure why one would, as it would now need a -replace to remove those characters,  and that's just extra work and unecessary. But just say'in...

"\$env:windir): this is my Windows folder"
C:\WINDOWS): this is my Windows folder

"\$env:windir : this is my Windows folder"
C:\WINDOWS : this is my Windows folder

"\$env:windir#: this is my Windows folder"
C:\WINDOWS#: this is my Windows folder

"\$env:windir|: this is my Windows folder"
C:\WINDOWS|: this is my Windows folder

"\$env:windir\: this is my Windows folder"
C:\WINDOWS\: this is my Windows folder

"\$env:windir/: this is my Windows folder"
C:\WINDOWS/: this is my Windows folder

"\$env:windir]: this is my Windows folder"
C:\WINDOWS]: this is my Windows folder