You asked a very similar question a few days ago:

Regex to grab data after the work "branch from"

Last time Corion suggested you take a look on CPAN with the search term P4. What did you find when you searched? How have you used that information to solve your problem?

By asking the same question again, without referring to your previous question or it's responses, it looks like you are ignoring our advice, and trying to get us to write code for you. If you are stuck with a problem, then we are happy to help, but we are not here to do your job for you.