Java RegEx testing class

RegexTester.java

import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

public class RegexTester {
    public static void main(String[] arguments) {
        String userInputPattern = arguments[0];
        System.err.println(userInputPattern);
        String userInputText = arguments[1];
        System.err.println(userInputText);
        try {
            Pattern p = Pattern.compile(userInputPattern);
            boolean b = Pattern.matches(userInputPattern, userInputText);
            System.err.println(b ? "Matches" : "Nope :(");
        } catch (PatternSyntaxException exception) {
            System.err.println(exception.getDescription());
            System.exit(1);
        }
        System.out.println("Syntax is ok.");
    }
}


How to run (OSx):
javac RegexTester.java
java RegexTester "regex" "string to match"