Pattern pattern() method in Java with Examples

Last Updated : 30 Jul, 2019

The pattern() method of the Pattern class in Java is used to get the regular expression which is compiled to create this pattern. We use a regular expression to create the pattern and this method used to get the same source expression.

Syntax:

public String pattern()

Parameters: This method does not accepts anything as parameter.

Return Value: This method returns the pattern’s source regular expression.

Below programs illustrate the pattern() method:
Program 1:

// Java program to demonstrate
// Pattern.pattern() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a REGEX String
        String REGEX = "(.*)(for)(.*)?";
  
        // create the string
        // in which you want to search
        String actualString
            = "code of Machine";
  
        // create pattern
        Pattern pattern1 = Pattern.compile(REGEX);
  
        // find the regular expressio of pattern
        String RegularExpression = pattern1.pattern();
  
        System.out.println("Pattern's RegularExpression = "
                           + RegularExpression);
    }
}

Output:

Pattern's RegularExpression = (.*)(for)(.*)?

Program 2:

// Java program to demonstrate
// Pattern.compile method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a REGEX String
        String REGEX = "(.*)(ee)(.*)?";
  
        // create the string
        // in which you want to search
        String actualString
            = "geeks";
  
        // create pattern
        Pattern pattern1 = Pattern.compile(REGEX);
  
        // find the regular expressio of pattern
        String RegularExpression = pattern1.pattern();
  
        System.out.println("Pattern's RegularExpression = "
                           + RegularExpression);
    }
}

Output:

Pattern's RegularExpression = (.*)(ee)(.*)?

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

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