在Python中使用Regex获取数组大小

I'm very, very new to regular expressions. I just picked it up about 3 hours ago, but I hit a snag, and I can't seem to shake it. So, as always, I turned to the internet to solve all my problems, and when it couldn't explain the answers to me, I searched on stackoverflow to see if someone else had asked my question, and finally just posted a new question when I couldn't answer it myself from browsing.I'm very, very new to regular expressions. I ju