Who said "I regret what I did to Dumbledore."?

This quote is attributed to Severus Snape.

I regret what I did to Dumbledore. - Severus Snape

"I regret what I did to Dumbledore."

Severus Snape

Character in Harry Potter and the Half-Blood Prince

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"Once again, you have allowed your emotions to distract you from what is really important."

"The mind is not a book, to be opened at will and examined at leisure."

"I am not interested in your opinions, you silly boy."

"Sit down. Sit. SIT!"