Powershell Get-Content specific content inside text

Here’s one possible solution. The result will be a hashtable, each key containing any array of ips for the set:

$result = @{}
get-content file.txt | foreach {
    if ($_ -match "#\s*SET\s+(\w+)") {
        $result[($key = $matches.1)] = @()
    elseif ($_ -notlike "#*") {
        $result[$key] += $_

Contents of $result:

Name                           Value                                                                                                                                                                                  
----                           -----                                                                                                                                                                                  
Y                              {[ip], [ip], [more ips]}                                                                                                                                                               
Z                              {[ip], [ip], [more ips]}                                                                                                                                                               
X                              {[ip], [ip], [more ips]}    

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