First we’ll unpack the three powerful classes residing in the java.util.regex package, then we’ll explore the Pattern class and its sophisticated pattern-matching constructs.

Furthermore, the update seeks to rectify the exclusion of primitive type patterns in the pattern matching for instanceof and switch, which had limited Java's expressiveness.

Further benefits of the Builder pattern when used with constructors are outlined in Item #2 of the Second Edition of Effective Java. Costs and Disadvantages ...