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

Quantifiers