You're welcome.

Where could I learn something about this string?

In a variety of places:

• The "Function Nodelet", which is on the right side near the bottom of the page of my browser here at the Monastery, has a link to the printf docs. I'm not sure if this nodelet is enabled by default.
• The official documentation is online: printf
• And it is also at your command prompt: perldoc -f printf

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