const str = `
user iotile
connection test4
address undefined:1883
remote_username iotile
remote_password guest
topic broadcast/# out 0 "" machine/d--0000-0000-0000-3039/
topic telegraf/# out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/response out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/heartbeat out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/status out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/control in 0 "" machine/d--0000-0000-0000-3039/
try_private false
notifications false 
cleansession true 

connection test6
address undefined:1883
remote_username iotile
remote_password guest
topic broadcast/# out 0 "" machine/d--0000-0000-0000-3039/
topic telegraf/# out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/response out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/heartbeat out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/status out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/control in 0 "" machine/d--0000-0000-0000-3039/
try_private false
notifications false 
cleansession true 

connection test7
address undefined:1883
remote_username iotile
remote_password guest
topic broadcast/# out 0 "" machine/d--0000-0000-0000-3039/
topic telegraf/# out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/response out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/heartbeat out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/status out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/control in 0 "" machine/d--0000-0000-0000-3039/
try_private false
notifications false 
cleansession true 

connection test
address flex2.eng.archsys.io:1883
remote_username iotile
remote_password guest
topic broadcast/# out 0 "" machine/d--0000-0000-0000-3039/
topic telegraf/# out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/response out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/heartbeat out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/status out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/control in 0 "" machine/d--0000-0000-0000-3039/
try_private false
notifications false 
cleansession true 

connection test2
address undefined:1883
remote_username iotile
remote_password guest
topic broadcast/# out 0 "" machine/d--0000-0000-0000-3039/
topic telegraf/# out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/response out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/heartbeat out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/status out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/control in 0 "" machine/d--0000-0000-0000-3039/
try_private false
notifications false 
cleansession true 

connection test3
address undefined:1883
remote_username iotile
remote_password guest
topic broadcast/# out 0 "" machine/d--0000-0000-0000-3039/
topic telegraf/# out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/response out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/heartbeat out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/status out 0 "" machine/d--0000-0000-0000-3039/
topic subsystems/+/control in 0 "" machine/d--0000-0000-0000-3039/
try_private false
notifications false 
cleansession true 

`


const result = str.match(/$connection/g)

console.log(result)