Fix blank image in html_signature when saving identity changes (#1490412)

CHANGELOG

@@ -26,6 +26,7 @@ RELEASE 1.1.2
 - Fix attached file path unsetting in database_attachments plugin (#1490393)
 - Fix issues when using moduserprefs.sh without --user argument (#1490399)
 - Fix potential info disclosure issue by protecting directory access (#1490378)
+- Fix blank image in html_signature when saving identity changes (#1490412)
 
 RELEASE 1.1.1
 -------------

program/steps/settings/save_identity.inc

@@ -208,7 +208,7 @@ function rcmail_attach_images($html)
     global $RCMAIL;
 
     $offset = 0;
-    $regexp = '/\s(poster|src)\s*=\s*[\'"]*\S+upload-display\S+file=rcmfile([0-9]+)[\s\'"]*/';
+    $regexp = '/\s(poster|src)\s*=\s*[\'"]*\S+upload-display\S+file=rcmfile(\w+)[\s\'"]*/';
 
     while (preg_match($regexp, $html, $matches, 0, $offset)) {
         $file_id  = $matches[2];