[MlMt] Lost the attachment check regular expression

[Jim Cook]

Hi
While looking through preferences I accidentally typed a character in 
the dialog box for the regular expression used in attachment checks.

I immediately pressed escape but the damage was done and my regex now 
says “a”.

Silly me.

I can’t find anyway to restore the default regex.

Can anyone help by either replying with the default or by saying how to 
restore default preferences?

Thanks!

Regards
Jim