pattern for specifying svn:ignore for files without extension

[Steve Cohen]

The build process of the application I am bringing under svn creates a 
number of unix binary executables that have no extension : for example

abcde
fghqp
etc.

I believe that * will match any files with or without periods so it 
isn't suitable.  Is there a pattern specifier that would embrace all 
files without an extension?

Alternatively, one common differentiating aspect of these files is that 
they have executable privileges.  Being able to svn:ignore based on this 
would be a nice feature to have.