Play Framework SMTP appender with exclusions

RegexUtils.java

import org.apache.commons.lang.StringUtils;
import java.util.regex.Pattern;

public class RegexUtils {
    private RegexUtils(){}

    public static Pattern matchAny(String[] patterns) {
        return matchAny(patterns, 0);
    }

    public static Pattern matchAny(String[] patterns, int flags) {
        StringBuilder uberString = new StringBuilder();
        String uber = StringUtils.join(patterns, ")|(?:");
        if (patterns.length > 1) {
            uber = "(?:" + uber + ")";
        }
        return Pattern.compile(uber, flags);
    }
}

RegexUtilsTests.java

import org.junit.Test;
import java.util.regex.Pattern;

public class RegexUtilsTests extends TestClass {
    @Test
    public void zero() {
        Pattern pattern = RegexUtils.matchAny(new String[0]);

        // empty regex, should match anything
        assertTrue(pattern.matcher("").find());
        assertTrue(pattern.matcher("a").find());
    }

    @Test
    public void one() {
        Pattern pattern = RegexUtils.matchAny(new String[]{"one"});

        assertTrue(pattern.matcher("zzz one zzz").find());
        assertFalse(pattern.matcher("zzz two zzz").find());
    }

    @Test
    public void two() {
        Pattern pattern = RegexUtils.matchAny(new String[]{"one", "two"});

        assertTrue(pattern.matcher("zzz one zzz").find());
        assertTrue(pattern.matcher("zzz two zzz").find());
        assertFalse(pattern.matcher("zzz three zzz").find());
    }
}

SMTPAppender.java

import notifiers.Mails;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;

import java.util.regex.Pattern;

/**
 * sends email in async manner.
 */
public class SMTPAppender extends AppenderSkeleton {
    private static String[] EMAIL_PATTERN_STRS = {
            "You wanted an exception", // Dev.throwException
            "java.util.concurrent.ExecutionException: java.net.ConnectException: null to", // Play will report ERROR logs on failed HTTP gets. See https://play.lighthouseapp.com/projects/57987-play-framework/tickets/1555-wsurlfetchget-write-an-error-log-on-failure
            "Action not found.*No method public static",
            "Action not found.*Error raised is.*not found", // example: manager.status action not found Action not found Action manager.status could not be found. Error raised is Controller controllers.manager not found
    };
    private static Pattern DO_NOT_EMAIL_PATTERN = RegexUtils.matchAny(EMAIL_PATTERN_STRS, Pattern.DOTALL | Pattern.MULTILINE | Pattern.CASE_INSENSITIVE);

    @Override
    protected void append(final LoggingEvent loggingEvent) {
        if (doNotEmail(loggingEvent)) {
            return;
        }
        Mails.notifyOnError(loggingEvent);
    }

    private boolean doNotEmail(LoggingEvent loggingEvent) {
        return loggingEvent.getMessage() != null &&
                DO_NOT_EMAIL_PATTERN.matcher(loggingEvent.getRenderedMessage()).find();
    }

    @Override
    public void close() {
    }

    @Override
    public boolean requiresLayout() {
        return false;
    }
}