Quickly familiarize yourself with regular expressions in Java and learn how to use them in various use-cases related to string manipulation.

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Regular expressions describe a pattern of characters used for searching a string. They are very useful for parsing information like dates, phone numbers, or zip codes from important text files such as code files, log files, spreadsheets, or documents. 

Below are the most common use cases of regular expressions: 
- Data validation of data fields or values like phone numbers, zip codes, email addresses, etc.
- Information extraction from text files for further processing
- Pattern matching of strings or textual information
- Search and replace operation on texts

This course will teach you how to perform pattern matching with a regular expression using a Java API for these practical use cases.

Tarun Telang

Tarun Telang is a passionate software engineer, leader, architect, author, and active contributor in various online technical forums.

Java Expert & Enterprise Software Architect

Mastering Regular Expressions in Java

## Matching specific characters

We use `[]` square brackets for matching specific characters using regular expressions. We use brackets to find a set of characters. See examples below: 
- `[ABC]`: Character class representing either `A`, `B`, or `C`.
- `[^ABC]`: Character class with negation, any character other than `A`, `B`, or `C`.
- `[0-9]`: Any numeric character, either of `0`, `1`, `2` ..... `8`, or `9`.
- `[^0-9]`: Any character other than `0`, `1`, `2` ..... `8`, or `9`.

# Matching specific characters

We use `[]` square brackets for matching specific characters using regular expressions. We use brackets to find a set of characters. See examples below: 
- `[ABC]`: Character class representing either `A`, `B`, or `C`.
- `[^ABC]`: Character class with negation, any character other than `A`, `B`, or `C`.
- `[0-9]`: Any numeric character, either of `0`, `1`, `2` ..... `8`, or `9`.
- `[^0-9]`: Any character other than `0`, `1`, `2` ..... `8`, or `9`.

Introduction

Java Regex APIs

Building Blocks of Regular Expressions

Course Wrap Up

Pattern Matching Using Quantifiers

Matching specific characters