How to use sed to extract substring

You want awk.

This would be a quick and dirty hack:

awk -F "\"" '{print $2}' /tmp/file.txt

PortMappingEnabled
PortMappingLeaseDuration
RemoteHost
ExternalPort
ExternalPortEndRange
InternalPort
PortMappingProtocol
InternalClient
PortMappingDescription

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