Catch Exception from replace method in powershell v5 - powershell

Question

I am trying to write a script to find and replace a string in a file. How do I catch an exception if the script fails to replace the string for some reason and log it in an external file? Here is what I have so far.
Write-Host "Checking Execution Policy"
$currentExecutionPolicy = Get-ExecutionPolicy
if( $currentExecutionPolicy -eq "RemoteSigned")
{
Write-Host "Execution policy check passed"
}
else
{
"Setting Execution policy to RemoteSigned as per https://msdn.microsoft.com/powershell/reference/5.1/Microsoft.PowerShell.Core/about/about_Execution_Policies"
Set-ExecutionPolicy Remotesigned
}
Write-Host "Starting Script"
#Recurse through all the file shares and find the file.
$rootPath='\\do.main.name\shared\Information Technology\IT\u.name'
$hotspotFile = Get-ChildItem -Path $rootPath -Recurse -Include "hotspot.mac"
Write-Host "Found file" $hotspotFile
$logstring = "Found file" + $hotspotFile
WriteLog $logstring
try
{
(Get-Content $hotspotFile).Replace("olddomain.com","do.main.name") | Set-Content $hotspotFile
}
catch
{
Write-Host "Failed to replace string -" $file
$logstring = "Failed to replace string -" + $file
WriteLog $logstring
}
#Logging
$Logfile = "F:\u.name\Documents\Logs\SCR_To_Find_And_Replace_Old_Domain_String.log"
Function WriteLog
{
Param ([string]$logstring)
Add-content $Logfile -value $logstring
}

Answer 1

Per the comments, I think a failed replace does not generate an exception so you can't use try catch.
Instead you could use an if test, e.g.:
If ($hotspotfile -notcontains "do.main.name") { }
Or test the file for the presence of the old string. You'd probably be wise to also put in an earlier if statement testing if the string was present in the file in the first place and skipping the replace and check if it wasn't.