Add a facility for contact name validation

src/main/java/envoy/util/Bounds.java

@@ -0,0 +1,32 @@
+package envoy.util;
+
+import java.util.regex.Pattern;
+
+/**
+ * Implements contact name validation.
+ * <p>
+ * Project: <strong>envoy-common</strong><br>
+ * File: <strong>Bounds.java</strong><br>
+ * Created: <strong>25.06.2020</strong><br>
+ * 
+ * @author Kai S. K. Engelbart
+ * @since Envoy Common v0.1-beta
+ */
+public class Bounds {
+
+	private Bounds() {}
+
+	/**
+	 * The regular expression against which contact names should be validated.
+	 * 
+	 * @since Envoy Common v0.1-beta
+	 */
+	public static final Pattern CONTACT_NAME_PATTERN = Pattern.compile("^\\w[a-zA-Z0-9-]{2,15}$");
+
+	/**
+	 * @param contactName the contact name to validate
+	 * @return {@code true} if the given contact name is valid
+	 * @since Envoy Common v0.1-beta
+	 */
+	public static boolean isValidContactName(String contactName) { return CONTACT_NAME_PATTERN.matcher(contactName).matches(); }
+}