Plain emails updated to handle "+" in local part

src/ObfuscateMailROT13.php

@@ -53,8 +53,8 @@ class ObfuscateMailROT13 implements ObfuscateMailInterface {
     // most of the work has already been done and at this stage the string
     // that is being passed is already an email address.
     $patterns = [
-      // Plain emails.
-      '|[_a-z0-9-]+(?:\.[_a-z0-9-]+)*@[a-z0-9-]+(?:\.[a-z0-9-]+)*(?:\.[a-z]{2,3})|i',
+      // Plain emails (updated to handle "+" in local part).
+      '|[_a-z0-9+\-]+(?:\.[_a-z0-9+\-]+)*@[a-z0-9-]+(?:\.[a-z0-9-]+)*(?:\.[a-z]{2,})|i',
     ];
 
     foreach ($patterns as $pattern) {