MDL-14898 upgraded html purifier to 3.1.0 in HEAD

lib/htmlpurifier/HTMLPurifier/AttrDef/URI/Email/SimpleCheck.php

@@ -0,0 +1,20 @@
+<?php
+
+/**
+ * Primitive email validation class based on the regexp found at 
+ * http://www.regular-expressions.info/email.html
+ */
+class HTMLPurifier_AttrDef_URI_Email_SimpleCheck extends HTMLPurifier_AttrDef_URI_Email
+{
+    
+    public function validate($string, $config, $context) {
+        // no support for named mailboxes i.e. "Bob <[email protected]>"
+        // that needs more percent encoding to be done
+        if ($string == '') return false;
+        $string = trim($string);
+        $result = preg_match('/^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i', $string);
+        return $result ? $string : false;
+    }
+    
+}
+