How to Remove Duplicates from a String in Java Using Regex ?

In Java programming, Regex (regular expressions) is a very important mechanism. It can be used to match patterns in strings. Regular expressions provide a short and simple syntax for describing the patterns of the text.

In this article, we will be learning how to remove duplicates from a String in Java using Regex.

Regex Implementation:

• Pattern: It is a pre-defined class. It can be used to represent the compiled version of a regular expression.
• Matchers: It is a class, that is used to match the pattern against a given input string and provides methods for matching, finding, replacing, and other operations.

Program to Remove Duplicates From a String in Java in Regex

Below is the Program to Remove Duplicates From a String in Java in Regex:

Original String: Java programming
String after removing duplicates: Jv poraming

Explanation of the above Program:

• In the above java program, it demonstrates that how to remove the duplicate characters of the given string.
• It can be implements using Patter and Matchers.
• First define the regex expression to remove the duplicates((.)(?=.*\\1))
• Then create the pattern object to compile the regex after that create the matcher that can be used to remove the duplicates characters into the program.