Stream-based Scanning of File-Buffers

[Nordlöw]

Is there a way to perform string/regexp scanning (using search-forward
or re-search-forward) in a file-buffer whose contents is loaded only
when it's needed, kind of like file streams in C, so that I only do a
physical read on the blocks that I actually scan and then skip the
rest of the file as soon as I get a hit.

Thanks in advance,
Nordlöw