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Tutorial
Regular expressions
Anchors: string start ^ and end $

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Regexp ^$

Which string matches the pattern ^$?

An empty string is the only match: it starts and immediately finishes.

The task once again demonstrates that anchors are not characters, but tests.

The string is empty "". The engine first matches the ^ (input start), yes it’s there, and then immediately the end $, it’s here too. So there’s a match.

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