Prevent html tags from being deleted ?

Hi,

I'd like to know if it's possible to prevent some specific html tags (div, p) from being
removed after a saving.

For ex the actual text is:

<div>text, text, text, text, etc....</div>

but the user (in the wysiwyg editor) after a too large text selection accidentally
remove the first div tag, so now we get:

text, text, etc....</div>

Is there any function, regex, plugin etc.. to prevent the div tag from being deleted ?


Thanks for advance.