Question: What is most accurate description of a regular expression?

1. A regular expression is a C# tool used to parse HTML
2. A regular expression is a special text string for describing a search patters.
3. A regular expression allows a variable to be passed by reference.
4. A regular expression allows a class to conform to the Equatable protocol.

Answer: The correct answer of the above question is Option B:A regular expression is a special text string for describing a search patters.