Java Regular Expression Example

The Java regex example demonstrates how to use a simple regular expression in Java with an example.

Java Simple Regular Expression

In the example, we have ten words in a list. We check which words match the .even regular expression.

package net.javaguides.corejava.regex;

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

public class JavaRegexExample {

    public static void main(String[] args) {

        List < String > words = Arrays.asList("One", "Two",
            "Three", "Four", "Five", "Six", "Seven", "Maven", "Amen", "eleven");

        Pattern p = Pattern.compile(".even");

        for (String word: words) {

            Matcher m = p.matcher(word);

            if (m.matches()) {
                System.out.printf("%s -> matches%n", word);
            } else {
                System.out.printf("%s -> does not match%n", word);
            }
        }
    }
}

Output:

One -> does not match
Two -> does not match
Three -> does not match
Four -> does not match
Five -> does not match
Six -> does not match
Seven -> matches
Maven -> does not match
Amen -> does not match
eleven -> does not match

We compile the pattern. The dot (.) metacharacter stands for any single character in the text.

Reference

https://www.javaguides.net/2019/12/java-regex-tutorial-regular-expressions.html