Controlling text size in posts

Now, what about the quote markdown, what would that be in html? for example [quote=“user1, post:66, topic:52”] <blockquote="user1,etc>?

Basically, if [quote=“user1, post:66, topic:52”] is the input then what is the output in raw code/html? I’m trying to detect when someone quotes, but I’m not picking up anything beginning with [quote= when posted.