global_defs {
	notification_email {
		example@163.com
	}
	notification_email_from example@example.com
}

vrrp_instance VI_1 {
    notify_fault "/etc/keepalived/to_fault.sh"
}

----------------------------------------------------

[
	["property", "global_defs"],
	["punctuation", "{"],
	["property", "notification_email"],
	["punctuation", "{"],
	["email", "example@163.com"],
	["punctuation", "}"],
	["property", "notification_email_from"],
	["email", "example@example.com"],
	["punctuation", "}"],
	["property", "vrrp_instance"],
	" VI_1 ",
	["punctuation", "{"],
	["property", "notify_fault"],
	["string", "\"/etc/keepalived/to_fault.sh\""],
	["punctuation", "}"]
]

----------------------------------------------------

Checks for string, email (alias string).