import re
reg = r"Interface01\s*:\s*adress\s+(.*)"
s = ("Interface01 :\n"
" adress\n"
" 192.168.0.1\n"
"next-interface:\n"
" interface02:\n"
" adress\n"
" 10.123.123.214\n"
"next-interface:\n"
" interface01 :\n"
" adress\n"
" 172.123.456.123")
m = re.search(reg, s)
if m:
print(m.group(1))
aW1wb3J0IHJlCnJlZyA9IHIiSW50ZXJmYWNlMDFccyo6XHMqYWRyZXNzXHMrKC4qKSIKCnMgPSAoIkludGVyZmFjZTAxIDpcbiIKCSIgICAgIGFkcmVzc1xuIgoJIiAgICAgICAgMTkyLjE2OC4wLjFcbiIKCSJuZXh0LWludGVyZmFjZTpcbiIKCSIgaW50ZXJmYWNlMDI6XG4iCgkiICAgICBhZHJlc3NcbiIKCSIgICAgICAgIDEwLjEyMy4xMjMuMjE0XG4iCgkibmV4dC1pbnRlcmZhY2U6XG4iCgkiIGludGVyZmFjZTAxIDpcbiIKCSIgICAgIGFkcmVzc1xuIgoJIiAgICAgICAgMTcyLjEyMy40NTYuMTIzIikKCm0gPSByZS5zZWFyY2gocmVnLCBzKQppZiBtOgoJcHJpbnQobS5ncm91cCgxKSk=