Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

public class Main {

    public static void main(String[] args) {
        System.out.println(getLastWord("this is a test"));
    }

    /**
     * Get the last word (pure alphabet word) from a String
     * 
     * @param source
     *            the string where the last word is to be extracted
     * @return the extracted last word or null if there is no last word
     */
    public static String getLastWord(String source) {
        if (source == null) {
            return null;
        }

        source = source.trim();

        if (source.isEmpty()) {
            return null;
        }

        if (containsSpace(source)) {
            final int LAST_WORD_GROUP = 1;
            String lastWordRegex = "\\s([A-z]+)[^A-z]*$";
            Pattern pattern = Pattern.compile(lastWordRegex);
            Matcher matcher = pattern.matcher(source);
            if (matcher.find()) {
                return matcher.group(LAST_WORD_GROUP);
            } else {
                return null;
            }

        } else {
            return source;
        }
    }

    private static boolean containsSpace(String source) {
        return source.contains(" ");
    }
}