How to run command in background and also capture the output

Question

In the middle of the script, I have a command that exposes the local port with ssh -R 80:localhost:8080 localhost.run I need to execute this command in the background, parse the output and save it into a variable.

The output returns:

Welcome to localhost.run!
...
abc.lhrtunnel.link tunneled with tls termination, https://abc.lhrtunnel.link

Need to capture this part:

https://abc.lhrtunnel.link

As a result something like this:

...
hostname=$(command)
echo $hostname
...