String Calculator Kata

Today, I have completed the String Calculator Kata. Below are my notes:

• It took me three hours to complete.
• The most time consuming activities involved performing TDD, which the kata description suggested to use, and figuring out how to handle certain regular expressions in Java.
• Java requires escaping the ']' character, but does not allow the use of the '\' character to do so. Instead, one must use the java.util.regex.Pattern class. This was a necessity for handling both long and multiple delimiters.
• I was able to DRY up some use cases, while keeping them DAMP.
• I had trouble employing DRY principles when writing the add() function. It was very unnatural to have to use multiple methods of dealing with regular expressions.

P.S. I would have to say that my level of self-awareness of copying code was III during this kata. Please see what the levels mean in my learning plan.