are what I am using the most from all the computer science theory from university. It’s a bit funny. At the office everyone regards me as an expert for regular expressions. Only because noone else ever bothers to use them only when it’s absolutely necessary … then it’s like this: “Can you look over my regexp here? I am not sure I did it right!” or “I cannot get my regexp to do what I want…”
I think regexps are very powerful and ever since java 1.4 implemented those, it is yet another reason to use java 🙂 Of course they were the only reason for me to use perl.