Re: acgeneral.m4 & unsupported case patterns

[Paul Eggert]

   From: Akim Demaille <[EMAIL PROTECTED]>
   Date: 22 May 2000 10:34:41 +0200

   I am not against giving a chance to `[!...]', but it has to be
   heavily tested.  Is there anybody who knows more?

I believe negated character ranges were added to /bin/sh around the
same time as shell functions.  They are definitely absent from the
Unix Version 7 sh documentation (I just checked).  When they were
added, there was some confusion as to the notation (^ versus !).

I would avoid them.  You can use expr instead; it's portable.