Pattern asPredicate() Method in Java with Examples

asPredicate() method of a Pattern class used to creates a predicate object which can be used to match a string.Predicate is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference. 

Syntax:

public Predicate asPredicate()

Parameters: This method accepts nothing as parameter. 

Return value: This method returns a predicate which can be used for matching on a string. 

Below programs illustrate the asPredicate() method: 

Program 1:

Java

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

import java.util.regex.*;
import java.util.function.*;

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
            = "aaeebbeecceeddee";

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

        // get Predicate Object
        Predicate<String> predicate
            = pattern.asPredicate();

        // check whether predicate match
        // with actualString
        boolean value = predicate
                            .test(actualString);

        // print result
        System.out.println("value matched: "
                           + value);
    }
}

Output:

value matched: true

Program 2:

Java

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

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

        // create the string
        // in which you want to search
        String actualString
            = "welcome geeks";

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

        // get Predicate Object
        Predicate<String> predicate
            = pattern.asPredicate();

        // check whether predicate match
        // with actualString
        boolean value
            = predicate.test(actualString);

        // print result
        System.out.println("value matched: "
                           + value);
    }
}

Output:

value matched: false

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