Answer for Powershell forum question by https://powershell.org/forums/topic/parsing-text-logic/

parse-inventory.ps1

# Split the records using a regex with lookahead.  It's flexible, selective and doesn't consume the delimiter
$records = $SwitchInfo -split "(?m)(?=^.+-network)"
foreach ($record in $records){
    #the match operator fills the matches collection and saves us splitting/parsing
    if ($record -match '([^ ]+)\s+cluster-network\s+([^ ]+)\s+(.+)'){
        $SwitchName = $matches[1]
        $SwitchIP = $matches[2]
        $SwitchModel = $matches[3]
        Switch ($SwitchModel) {
            'CN1610' {
                $SwitchMake = 'Brocade'
            }
            'NX3132V' {
                $SwitchMake = 'Cisco'
            }
        }
        #we should always get a match, but it will only be useful for Brocade data
        if ($record -match 'Serial Number: (.+)'){
            $SwitchSerial = $matches[1]
        }
        #cisco serial numbers are embedded between brackets in the serial number so use the match operator to test and grab it.
        if ($SwitchName -match '\(([^)]+)\)') {
            $SwitchSerial = $matches[1]
        }
        $switchname
        $SwitchIP
        $SwitchModel
        $SwitchSerial
    }
}