import re;
content = ["hostname(config)#aaa new-model", "#fdfsfd b", "kthik", "pooooo", "shh"]
res = []
for data in content:
res.extend(re.findall(r'#(\w+)', data))
print(res)
aW1wb3J0IHJlOwpjb250ZW50ID0gWyJob3N0bmFtZShjb25maWcpI2FhYSBuZXctbW9kZWwiLCAiI2ZkZnNmZCBiIiwgImt0aGlrIiwgInBvb29vbyIsICJzaGgiXQpyZXMgPSBbXQpmb3IgZGF0YSBpbiBjb250ZW50OgoJcmVzLmV4dGVuZChyZS5maW5kYWxsKHInIyhcdyspJywgZGF0YSkpCnByaW50KHJlcykKCQ==