The API consists of three classes–Pattern, Matcher, and PatternSyntaxException–all located in the java.util.regex package: Pattern objects, also known as patterns , are compiled regexes.

After learning Java regex tutorial, you will be able to test your regular expressions by the Java Regex Tester Tool. Java Regex API provides 1 interface and 3 classes in java.util.regex package.

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.

In Java, I was surprised by how close the performance was for standard regular expressions to using string primitives. String primitives took 188 ms to process the 100,000 lines. Standard regular ...