Regular expressions in Java, Part 2: The Regex API. how-to. May 16, 2017 26 mins. APIs Core Java Development Tools. ... Download the source code for example applications in this tutorial.

You will begin by discovering what regular expressions are and how they work with Java. You will learn when and where to apply the methods for finding patterns in digits, letters, Unicode characters, ...

What is a Regular Expression? A regular expression (or regex for short) is a sequence of characters that forms a search pattern. These expressions are helpful when we want to validate input from a ...