import re
s='address:\n 123 beautiful house \n ---blabla--- \n another street \n ---more blabla--- \n ---extra bla--- \n one country\n---a lot blabla'
value = re.search('address:\n((?:.*\n){1,6})',s)
if value:
lines = value.group(1).splitlines()
print(lines[0].strip())
if len(lines) > 2:
print(lines[2].strip())
if len(lines) > 5:
print(lines[5].strip())
aW1wb3J0IHJlCnM9J2FkZHJlc3M6XG4gMTIzIGJlYXV0aWZ1bCBob3VzZSBcbiAtLS1ibGFibGEtLS0gXG4gYW5vdGhlciBzdHJlZXQgXG4gLS0tbW9yZSBibGFibGEtLS0gXG4gLS0tZXh0cmEgYmxhLS0tIFxuIG9uZSBjb3VudHJ5XG4tLS1hIGxvdCBibGFibGEnCnZhbHVlID0gcmUuc2VhcmNoKCdhZGRyZXNzOlxuKCg/Oi4qXG4pezEsNn0pJyxzKQppZiB2YWx1ZToKCWxpbmVzID0gdmFsdWUuZ3JvdXAoMSkuc3BsaXRsaW5lcygpCglwcmludChsaW5lc1swXS5zdHJpcCgpKQoJaWYgbGVuKGxpbmVzKSA+IDI6CgkJcHJpbnQobGluZXNbMl0uc3RyaXAoKSkKCWlmIGxlbihsaW5lcykgPiA1OgoJCXByaW50KGxpbmVzWzVdLnN0cmlwKCkp