regex support for email whitelist

src/main/java/fr/xephi/authme/service/ValidationService.java

@@ -30,6 +30,7 @@
 import java.util.Locale;
 import java.util.Set;
 import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
 
 import static fr.xephi.authme.util.StringUtils.isInsideString;
 
@@ -202,13 +203,21 @@ private boolean validateWhitelistAndBlacklist(String value, Property<List<String
 
     private static boolean containsIgnoreCase(Collection<String> coll, String needle) {
         for (String entry : coll) {
-            if (entry.equalsIgnoreCase(needle)) {
+            if (entry.startsWith("r:")) {
+                String pattern = entry.substring(2);
+                try {
+                    if (Pattern.compile(pattern, Pattern.CASE_INSENSITIVE).matcher(needle).matches()) {
+                        return true;
+                    }
+                } catch (PatternSyntaxException e) {
+                    //possible way to log error?
+                }
+            } else if (entry.equalsIgnoreCase(needle)) {
                 return true;
             }
         }
         return false;
     }
-
     /**
      * Loads the configured name restrictions into a Multimap by player name (all-lowercase).
      *

src/main/java/fr/xephi/authme/settings/properties/EmailSettings.java

@@ -63,7 +63,7 @@ public final class EmailSettings implements SettingsHolder {
     public static final Property<List<String>> DOMAIN_BLACKLIST =
         newListProperty("Email.emailBlacklisted", "10minutemail.com");
 
-    @Comment("Whitelist ONLY these domains for emails")
+    @Comment("Whitelist ONLY these domains for emails. Use 'r:' prefix for regex")
     public static final Property<List<String>> DOMAIN_WHITELIST =
         newListProperty("Email.emailWhitelisted");