What are some good ways to parse a file?

Question

C++ / C#

Greetings!
There are text files with the same line structure:

header
id:key:value
id:key:value
.....
content
footer:key:value

Can you advise the most "correct" way in your opinion to parse?
And then something regular, in my opinion, has long been outdated, but nothing better comes to mind.
Preferably without third-party libraries.

Answer 1

If id, key, and value do not contain colons, all this is steamed by a banal split on this character.