Pattern toString() Method in Java with Examples

toString() method of a Pattern class used to return the string representation of this pattern. This return the regular expression from which this pattern was compiled.

Syntax:

public String toString()

Parameters: This method accepts nothing as parameter.

Return value: This method returns a string representation of this pattern.

Below programs illustrate the toString() method:

Program 1:

// Java program to demonstrate
// Pattern.toString() method

import java.util.regex.*;
public class GFG {
    public static void main(String[] args)
    {
        // create a REGEX String
        String REGEX = "geeks";

        // create a Pattern using REGEX
        Pattern pattern = Pattern.compile(REGEX);

        // print pattern
        System.out.println("Pattern:" + pattern);
    }
}

Output:

Pattern:geeks

Program 2:

// Java program to demonstrate
// Pattern.toString() method

import java.util.regex.*;
public class GFG {
    public static void main(String[] args)
    {
        // create a REGEX String
        String REGEX = "[* & # $ !]+\\S";

        // create a Pattern using REGEX
        Pattern pattern = Pattern.compile(REGEX);

        // print pattern
        System.out.println("Pattern:" + pattern);
    }
}

Output:

Pattern:[* & # $ !]+\S

Reference: https://docs.oracle.com/javase/10/docs/api/java/util/regex/Pattern.html#toString()