How do I find everything between two characters after a word using grep, without outputting the entire line?

Posted by Nick Sweeting on Stack Overflow See other posts from Stack Overflow or by Nick Sweeting
Published on 2010-12-29T09:21:36Z Indexed on 2012/07/08 3:16 UTC
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I am downlading the info.0.json file from xkcd and trying to parse just the alt text. I don't care if there are quotes around it or not. The problem it that the info.0.json file is all one line, and the alt text is in quotes after the word "alt=". Trying cat info.0.json | grep alt just returns the whole file (because it's all one line). What is the grep or sed code that will get me the alt text?

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