diff --git a/data/web/inc/ajax/regex_validation.php b/data/web/inc/ajax/regex_validation.php
deleted file mode 100644
index 6bd8c931..00000000
--- a/data/web/inc/ajax/regex_validation.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-session_start();
-require_once $_SERVER['DOCUMENT_ROOT'] . '/inc/prerequisites.inc.php';
-header('Content-Type: application/json');
-if (!isset($_SESSION['mailcow_cc_role'])) {
-  exit();
-}
-if (isset($_GET['regex'])) {
-  $regex_lines = preg_split("/(\r\n|\n|\r)/", $_GET['regex']);
-  foreach ($regex_lines as $line => $regex) {
-    if (empty($regex) || substr($regex, 0, 1) == "#") {
-      continue;
-    }
-    if (empty($regex) || substr($regex, 0, 1) != "/") {
-      echo json_encode(array('type' => 'danger', 'msg' => 'Line ' . ($line + 1) . ': Invalid regex'));
-      exit();
-    }    
-    if (@preg_match($regex, 'Lorem Ipsum') === false) {
-      echo json_encode(array('type' => 'danger', 'msg' => 'Line ' . ($line + 1) . ': Invalid regex "' . $regex . '"'));
-      exit();
-    }
-  }
-  echo json_encode(array('type' => 'success', 'msg' => $lang['add']['validation_success']));
-}
-?>
diff --git a/data/web/js/site/admin.js b/data/web/js/site/admin.js
index 1b500a18..21a513b1 100644
--- a/data/web/js/site/admin.js
+++ b/data/web/js/site/admin.js
@@ -5,6 +5,7 @@ jQuery(function($){
   var entityMap={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;","/":"&#x2F;","`":"&#x60;","=":"&#x3D;"};
   function jq(myid) {return "#" + myid.replace( /(:|\.|\[|\]|,|=|@)/g, "\\$1" );}
   function escapeHtml(n){return String(n).replace(/[&<>"'`=\/]/g,function(n){return entityMap[n]})}
+  function validateRegex(e){var t=e.split("/"),n=e,r="";t.length>1&&(n=t[1],r=t[2]);try{return new RegExp(n,r),!0}catch(e){return!1}}
   function humanFileSize(i){if(Math.abs(i)<1024)return i+" B";var B=["KiB","MiB","GiB","TiB","PiB","EiB","ZiB","YiB"],e=-1;do{i/=1024,++e}while(Math.abs(i)>=1024&&e<B.length-1);return i.toFixed(1)+" "+B[e]}
   function hashCode(t){for(var n=0,r=0;r<t.length;r++)n=t.charCodeAt(r)+((n<<5)-n);return n}
   function intToRGB(t){var n=(16777215&t).toString(16).toUpperCase();return"00000".substring(0,6-n.length)+n}
@@ -33,21 +34,27 @@ jQuery(function($){
   $(".validate_rspamd_regex").click(function( event ) {
     event.preventDefault();
     var regex_map_id = $(this).data('regex-map');
-    var regex_data = $(jq(regex_map_id)).val();
-    $.ajax({
-      dataType: 'json',
-      url: "/inc/ajax/regex_validation.php",
-      type: "get",
-      data: { regex: regex_data },
-      complete: function(data) {
-        var response = (data.responseText);
-        response_obj = JSON.parse(response);
-        if (response_obj.type == "success") {
-          $('button[data-id="' + regex_map_id + '"]').attr({"disabled": false});
-        }
-        mailcow_alert_box(response_obj.msg, response_obj.type);
-      },
-    });
+    var regex_data = $(jq(regex_map_id)).val().split(/\r?\n/);
+    var regex_valid = true;
+    for(var i = 0;i < regex_data.length;i++){
+      if(regex_data[i].startsWith('#') || !regex_data[i]){
+        continue;
+      }
+      if(!validateRegex(regex_data[i])) {
+        mailcow_alert_box('Cannot build regex from line ' + (i+1), 'danger');
+        var regex_valid = false;
+        break;
+      }
+      if(!regex_data[i].startsWith('/') || !/\/[ims]?$/.test(regex_data[i])){
+        mailcow_alert_box('Line ' + (i+1) + ' is invalid', 'danger');
+        var regex_valid = false;
+        break;
+      }
+    }
+    if (regex_valid) {
+      mailcow_alert_box('Regex OK', 'success');
+      $('button[data-id="' + regex_map_id + '"]').attr({"disabled": false});
+    }
   });
 	$('.textarea-code').on('keyup', function() {
     $('.submit_rspamd_regex').attr({"disabled": true});
diff --git a/data/web/lang/lang.de.php b/data/web/lang/lang.de.php
index 60fe487c..621abb96 100644
--- a/data/web/lang/lang.de.php
+++ b/data/web/lang/lang.de.php
@@ -922,4 +922,5 @@ $lang['admin']['rspamd_global_filters'] = 'Globale Filter-Maps';
 $lang['admin']['rspamd_global_filters_info'] = 'Globale Filter-Maps steuern globales White- und Blacklisting dieses Servers. Die akzeptierte Form für Einträge sind <b>ausschließlich</b> Regular Expressions.
   Trotz rudimentärer Überprüfung der Map, kann es zu fehlerhaften Einträgen kommen, die Rspamd im schlechtesten Fall mit unvorhersehbarer Funktionalität bestraft.<br>
   Das korrekte Format lautet "/pattern/options" (Beispiel: <code>/.+@domain\.tld/i</code>).<br>
-  Der Name der Map beschreibt die jeweilige Funktion.';
+  Der Name der Map beschreibt die jeweilige Funktion.<br>
+  Rspamd versucht die Maps umgehend aufzulösen. Bei Problemen sollte <a href="" data-toggle="modal" data-container="rspamd-mailcow" data-target="#RestartContainer">Rspamd manuell neugestartet werden</a>.';
diff --git a/data/web/lang/lang.en.php b/data/web/lang/lang.en.php
index f170ab1e..27c7408a 100644
--- a/data/web/lang/lang.en.php
+++ b/data/web/lang/lang.en.php
@@ -945,5 +945,6 @@ $lang['danger']['extra_acl_invalid_domain'] = 'External sender "%s" uses an inva
 $lang['admin']['rspamd_global_filters_agree'] = "I will be careful!";
 $lang['admin']['rspamd_global_filters'] = 'Global filter maps';
 $lang['admin']['rspamd_global_filters_info'] = 'Global filter maps contain different kind of global black and whitelists. Their names explain their purpose. All content must contain valid regular expression in the format of "/pattern/options" (e.g. <code>/.+@domain\.tld/i</code>).<br>
-  Although rudimentary checks are being executed on each line of regex, Rspamds functionality can be broken, if it fails to read the syntax correctly.';
+  Although rudimentary checks are being executed on each line of regex, Rspamds functionality can be broken, if it fails to read the syntax correctly.<br>
+  Rspamd will try to read the map content when changed. If you experience problems, <a href="" data-toggle="modal" data-container="rspamd-mailcow" data-target="#RestartContainer">restart Rspamd</a> to enforce a map reload.';