Re: Making tab-complete.c easier to maintain

Michael Paquier <michael.paquier@gmail.com> writes:
> On Sat, Dec 19, 2015 at 5:42 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> 2. Why does MatchAnyExcept use "'" as the inversion flag, rather than
>> say "!" or "~" ?  Seems pretty random.

> Actually, "'" is not that much a good idea, no? There could be single
> quotes in queries so there is a risk of interfering with the
> completion... What do you think would be good candidates? "?", "!",
> "#" or "&"?

We don't care whether the character appears in queries; it only matters
that it not be something we'd need to use in patterns.  My inclination
is to use "!".
        regards, tom lane