Matcher pattern() method in Java with Examples

The pattern() method of Matcher Class is used to get the pattern to be matched by this matcher.

Syntax:

public Pattern pattern()

Parameters: This method do not accepts any parameter.

Return Value: This method returns a Pattern which is the pattern to be matched by this Matcher.

Below examples illustrate the Matcher.pattern() method:

Example 1:

// Java code to illustrate pattern() method

import java.util.regex.*;

public class GFG {
    public static void main(String[] args)
    {

        // Get the regex to be checked
        String regex = "Geeks";

        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);

        // Get the String to be matched
        String stringToBeMatched
            = "GeeksForGeeks";

        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);

        // Get the Pattern using pattern() method
        System.out.println("Pattern: "
                           + matcher.pattern());
    }
}

Output:

Pattern: Geeks

Example 2:

// Java code to illustrate pattern() method

import java.util.regex.*;

public class GFG {
    public static void main(String[] args)
    {

        // Get the regex to be checked
        String regex = "GFG";

        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);

        // Get the String to be matched
        String stringToBeMatched
            = "GFGFGFGFGFGFGFGFGFG";

        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);

        // Get the Pattern using pattern() method
        System.out.println("Pattern: "
                           + matcher.pattern());
    }
}

Output:

Pattern: GFG

Reference: Oracle Doc