This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
I know that there are methods in the String class which do some String manipulation but I've come across to this so called "regular expression" which also talks about Strings. What is this regular expression? How is it use in java?