PowerShell -Replace appending (oddly) instead of replacing - powershell

Question

EDIT: PowerShell version is 5.1
I am writing some code that will take the value of a variable from a file, and if that string is made up of other variables within the file, it will locate them and replace it to reconstruct the run-time value. It assumes the variable contains a string, and that the string describes a directory.
For example, the file contains:
$var0 = "C:\Users\v-anad\Documents"
$var1 = "$var0\TestFolder"
Then when the code looks for $var1, it should return something like: "C:\Users\v-anad\Documents\TestFolder\"
However, the actual output I see is:
\TestFolder"-anad\Documents"
When it replaces, it deletes the correct substring ($var0), but when it inserts the value of $var0, it skips over the characters that existed there before, and appends the remaining characters to the end of the string. I have no clue what/where I've gone wrong.
Here is the code in question:
function Get-Var-Value-In-File([string]$varName, [string]$file) {
$regex = "(?<=\$varName = )[^`n]*"
$content = Get-Content -Raw $file
return [regex]::Match($content, $regex).Value
}
$file = 'C:\Users\v-anad\Documents\TestFolder\TestVars.ps1'
$var = '$var1'
$value = Get-Var-Value-In-File $var $file
$regex = "\$[^\\]*"
$nextVar = [regex]::Match($value, $regex).Value
$nextValue = Get-Var-Value-In-File $nextVar $file
Write-Output "$var = $value"
Write-Output "$nextVar = $nextValue"
Write-Output $nextVar.Replace($nextVar, $nextValue)
Write-Output ($value -replace [regex]::Escape($nextVar),$nextValue)
Output:
$var1 = "$var0\TestFolder"
$var0 = "C:\Users\v-anad\Documents"
"C:\Users\v-anad\Documents"
\TestFolder"-anad\Documents"
Note how the code above does not account for the extra quotes that would be inserted into the final value, so should this curious behavior be fixed, the output will be: ""C:\Users\v-anad\Documents"\TestFolder\"

Answer 1

The problem was there was a carriage return (\r, or `r in PowerShell) that my regex included in the match, causing the behavior when the string replacement occurred. Thanks to PerSerAl for being a second pair of eyes to catch it.