Figuring out what this sed command do - regex

Question

I'm having a hard time trying to discover what the next comand is doing.
I'm trying to monitor different services on Linux using systemctl. I need a Json output with all the services on Linux that are running on the machine.
The problem is that with this comand the Status ouput is: "enable enabled". I only need the first parameter (state), and trying to delete the second one (Vendor preset) I really don't get it working. Basically because I don't understand it. I know with Sed is trying to replace some strings but with so many characters for me this isn't readable.
echo "{\"data\":[$(systemctl list-unit-files --type=service|grep \.service|grep -v "#"|sed -E -e "s/\.service\s+/\",\"{#STATUS}\":\"/;s/(\s+)?$/\"},/;s/^/{\"{#NAME}\":\"/;$ s/.$//")]}"
Result:
"data": [{
"{#NAME}": "accounts-daemon",
"{#STATUS}": "enabled enabled"
},
{
"{#NAME}": "acpid",
"{#STATUS}": "disabled enabled"
}, {
"{#NAME}": "zabbix-agent",
"{#STATUS}": "enabled enabled"
}
]
}
Expected result:
"data": [{
"{#NAME}": "accounts-daemon",
"{#STATUS}": "enabled"
},
{
"{#NAME}": "acpid",
"{#STATUS}": "disabled"
}, {
"{#NAME}": "zabbix-agent",
"{#STATUS}": "enabled"
}
]
}
Command without "sed": systemctl list-unit-files --type=service
UNIT FILE
STATE
VENDOR PRESET
accounts-daemon.service
enabled
enabled
acpid.service
disabled
enabled
zabbix-agent
static
enabled

Answer 1

The relevant substitute in your code is
s/(\s+)?$/
Try to replace that by deleting everyting starting with the first seperator (\s)
That is
s/\s.*$/
The modified command becomes
echo "{\"data\":[$(systemctl list-unit-files --type=service|grep \.service|grep -v "#"|sed -E -e "s/\.service\s+/\",\"{#STATUS}\":\"/;s/\s.*$/\"},/;s/^/{\"{#NAME}\":\"/;$ s/.$//")]}"