I would buy another book,
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This review is from: Programming Perl: Unmatched power for text processing and scripting (Kindle Edition)
I bought this to refresh my memory of Perl and of its strength in using regular expressions. This book seems to jump about a lot in its explanation of Perl and introduces concepts without explaining them, which I found very confusing, expecially as I was reading it on a Kindle and couldn't thumb through the book to find other sections quickly!
Unfortunately it didn't help with regular expressions - it mentioned them on occasion but not all in one place and I had to resort to Google in the end.