PowerShell -replace

I am attempting to replace part of a string and replace it with another.

Here is my string:
2/6/2020 3:46:22 PM - Server Name                              =>HHHHHHHHHAA01.nidy.state.xx.us
I want to replace, "2/6/2020 3:46:22 PM - Server Name" with "Server Name"

Below is what I have so far and I stuck

$replace_space = Get-Content C:\Temp\Environment_Verification_NGDI\UAT27_a.txt -Encoding Ascii
$replace_space -replace '(?<=Server Name=").*?(?=")','Server Name' | Set-Content C:\Temp\Environment_Verification_NGDI\UATxx_b.txt

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