https://powershell.org/forums/topic/trying-to-filter-results-and-i-have-no-idea-how-and-a-few-other-misc-questions/

ConvertFromString.ps1

$data = @'
Interface name : TP-LINK
There are 1 networks currently visible.

SSID 1 : CableWiFi
Network type : Infrastructure
Authentication : Open
Encryption : None
BSSID 1 : dx:a7:x9:xx:xa:xx
Signal : 92%
Radio type : 802.11n
Channel : 12
Basic rates (Mbps) : 60
Other rates (Mbps) : 5.5 9 11 12 18 24 36 48 54 96

Interface name : TP-LINK
There are 1 networks currently visible.

SSID 1 : CableWiFi2
Network type : Infrastructure
Authentication : Open
Encryption : None
BSSID 1 : dx:a7:x9:xx:xa:xx
Signal : 91%
Radio type : 802.11n
Channel : 11
Basic rates (Mbps) : 60
Other rates (Mbps) : 5.5 9 11 12 18 24 36 48 54 96
'@

$template = @'
Interface name : TP-LINK
There are 1 networks currently visible.

SSID 1 : {[string]SSID*:CableWiFi}
Network type : Infrastructure
Authentication : Open
Encryption : None
BSSID 1 : dx:a7:x9:xx:xa:xx
Signal : {Signal:91%}
Radio type : 802.11n
Channel : {[int]Channel:11}
Basic rates (Mbps) : 60
Other rates (Mbps) : 5.5 9 11 12 18 24 36 48 54 96

Interface name : TP-LINK
There are 1 networks currently visible.

SSID 1 : {[string]SSID*:CableWiFi2}
Network type : Infrastructure
Authentication : Open
Encryption : None
BSSID 1 : dx:a7:x9:xx:xa:xx
Signal : {Signal:92%}
Radio type : 802.11n
Channel : {[int]Channel:12}
Basic rates (Mbps) : 60
Other rates (Mbps) : 5.5 9 11 12 18 24 36 48 54 96
'@

$data | ConvertFrom-String -TemplateContent $template