lowercase in MIME for variables name*1*, name*2*...

src/cpp/Attachment.cpp

@@ -302,7 +302,7 @@ cleanString (string line) {
   DEF_LOG ("Attachment::cleanString", "line: " << line.substr (0, 100) << "...");
 
   static const regex findPart ("(((\"(\\\\.|[^\\\\])*\")|\\s|[^;\\\"])+;?)");
-  static const regex findVarVal ("(\\s*[a-zA-Z_*-]+=)(.*;?)");
+  static const regex findVarVal ("(\\s*[a-zA-Z_*-]+(\\*[0-9]+\\*)?=)(.*;?)");
   string result;
   smatch m1, m2;
 
@@ -316,7 +316,7 @@ cleanString (string line) {
       LOG ("id: " << id);
       toLower (id);
       result += id;
-      result += m2[2];
+      result += m2[3];
     } else
       result += part;
     line = m1.suffix ();