import re

text = """unit 3 {
    arp-options {
        aging-timer 5;
    }
    family inet4 {
        address 2.33.1.2/255.255.255.0;
        address 2.33.2.2/255.255.255.0;
        address 2.33.3.2/255.255.255.0;
        address 2.33.4.2/255.255.255.0;
    }
}"""

m = re.search(r"family inet4\s*{([^{}]*)}", text)
if m:
	res = [x.strip().split()[-1].strip(';') for x in m.group(1).strip().splitlines()]
	print(res)