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Mastering Regular Expressions in Java

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  • Post last modified:May 3, 2024


Regular expressions (regex) are powerful tools for pattern matching and manipulation of text. In Java, the java.util.regex package provides a rich set of classes for working with regular expressions. In this tutorial, we’ll explore the fundamentals of java.util.regex and guide you through practical examples to showcase its usage.

Basics of java.util.regex:

1. Pattern and Matcher:

The Pattern class represents a compiled regular expression, while the Matcher class performs matching operations. To use regular expressions in Java, start by creating a Pattern and then obtaining a Matcher from it:

Commonly Used Regular Expression Patterns:

2. Matching Digits:

3. Matching Email Addresses:

Capturing Groups:

4. Extracting Parts of a String:

Replacement Operations:

5. Replacing Matching Patterns:


The java.util.regex package in Java empowers developers to work with regular expressions effectively. This tutorial covered the basics of using Pattern and Matcher, demonstrated common regex patterns, highlighted capturing groups, and showcased replacement operations. Regular expressions are a versatile tool, and mastering them can greatly enhance your ability to manipulate and validate textual data in Java applications. As you explore further, you’ll discover more advanced features and gain a deeper understanding of the power of regular expressions.

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