Ethereal-users: Re: [Ethereal-users] Capture filters: Add Expression button missing; ARP from sp

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From: Guy Harris <guy@xxxxxxxxxx>
Date: Fri, 2 May 2003 10:52:41 -0700
On Fri, May 02, 2003 at 09:49:54AM -0700, Michael Hairston wrote:
> Why is the "Add Expression.." button missing from the capture filter
> window?

Because the capture filter syntax (which is defined by libpcap; changing
it isn't likely to happen, for compatiblity reasons) isn't as regular as
the display filter syntax, and changes from libpcap release to libpcap
release (new capabilities are added) in ways that aren't necessarily
easy for an "Add Expression" button implementation to determine, so
nobody's written any support for such a button.