Custom Character String of #_# causes character loss of _ (bad escaping)

The following string causes loss of the _ character after saving the confluence site.

#PutApplName#_#PUTDATE#_#CID#_#TIMESTAMP#_#COUNT#.txt (created in TinyMCE) 
--> save --> 
[PutApplName]\#_\#PUTDATE#_\#CID#_\#TIMESTAMP#_\#COUNT#.txt (result after saving in wiki markup)

This will destroy the entered string - maybe escaping every _ and # automaticaly within TinyMCE will help?

This happens also here in jira ! Only the {code} tag will help.