Question

How to use Pattern.compile() and Pattern.Matcher() to match regular expression in Java

Answer 1

package javaapplication1;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {
            
            // "pi" and 5 digits
            Pattern pattern = Pattern.compile("pi\\d\\d\\d\\d\\d");

            Matcher m = pattern.matcher("pi31415");
            if (m.matches()) 
                System.out.println("match");
            else
                System.out.println("not match");
            
            m = pattern.matcher("pi314");
            if (m.matches()) 
                System.out.println("match");
            else
                System.out.println("not match");

        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}

/*
             
run:
       
match
not match
    
 */

 

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