function xml2html(options) {
     withStylesheets(function() {
         var xml = options.xml.replace(/\/(\s+)/g, '<br />$1');
+        xml = xml.replace(/([^a-zA-Z0-9ąćęłńóśźżĄĆĘŁŃÓŚŹŻ\s<>«»\\*_!,:;?."'=#()\/-]+)/g, '<alien>$1</alien>');
         var parser = new DOMParser();
         var serializer = new XMLSerializer();
         var doc = parser.parseFromString(xml, 'text/xml');
 
                        </xsl:choose>               
         </xsl:for-each>
     </xsl:template>
-    
+
+    <xsl:template match="alien">
+            <span class="alien" x-pass-thru="true">
+                <xsl:apply-templates select="node()">
+                    <xsl:with-param name="mixed" select="true()" />
+                </xsl:apply-templates>
+            </span>
+    </xsl:template>
 </xsl:stylesheet>
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