I believe lot of us are used to Alfred clipboard history and it saves a lot of time.
As a developer, I have it set to 7 days history and use it a lot of times to temporarily store IP addresses and passwords. For example, I know password starts with "R$" so I can easily filter it. Problem is, I cant remember the IP address and there is no way to search for it.
This problem could be solved using regex. I could filter all clipboards that contains 3 dots and easily find all IP addresses.