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I’m frustrated

Head first programming, page 52 begins with the phrase: You already know how to find a substring.Where did I learn that?

On page 52, we try to find the location of the characters >$ so we can figure out where the substring that contains the price is located.
The page begins by saying that "You already know how to find a substring". I don't know why the authors assumed I know how to find a substring.
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