正则表达式，如何使用正则表达式获得一定数量的文本行？

I am trying to pull the class and class number along with the prerequisites. However I am having trouble getting just the course (Ex: ACCT 203), up to and including the prerequisites (Ex: ACCT 301) and nothing else. I am doing this in python, in hopes of later inserting this data into a database. Can anyone help with this? I am relatively new to regex.I am trying to pull the class and class number