[Bug Report] Auto-generated regexps for appimage /tmp paths duplicate the a-z character class #1587

To Reproduce:

1. Download an AppImage, e.g. Handy

2. Launch it so it makes a request

3. Allow the request

4. Check the "From this executable" path that was created

   ^/tmp/\.mount_handy_[0-9a-za-z]+\/.*handy$
   

5. Check the name of the rule - it will have the same duplication.

Expected behavior (optional):

The regexp should presumably include [0-9a-zA-Z], but OpenSnitch may pass the operand lowercase (even for paths, which may not be correct on case-sensitive filesystems, but that'd be a separate issue)

Screenshots:

See also

#1392 (comment)

This was so easy to miss that I ended up with tens of rules containing a-za-z: