How do I parse HTML using regular expressions in C#?

Question

How do I parse HTML using regular expressions in C#?

For example, given HTML code

 t1      sp         


        

Answer 1

This has already been answered literally dozens of times, but it bears repeating: regular expressions can only parse regular languages, that's why they are called regular expressions. HTML is not a regular language (as probably every college student in the last decade has proved at least once), and therefore cannot be parsed by regular expressions.