I’ve created the RegexDemo application to demonstrate Java’s regular expressions and the various methods located in the Pattern, Matcher, and PatternSyntaxException classes.

Explore the Regex API Pattern, Matcher, and PatternSyntaxException are the three classes that comprise the Regex API. Each class offers methods that you can use to integrate regexes into your code.

Our regular expression thus matches a word, followed by one or more whitespace characters, followed by a second instance of the word. The trailing word boundary sequence (\) is necessary to prevent ...