Re: pgsql: Add basic TAP tests for psql's tab-completion logic.

Tom Lane <tgl@sss.pgh.pa.us> writes:

> Cool, I'll go commit a fix along those lines.  Thanks for tracing
> this down!

Here's one final style cleanup for the TAP test.

- use like() for the banner test
- pass the regexes around as qr// objects, so they can be
  syntax-highlighted properly, and don't need regex
  metacharacter-escaping backslashes doubled.
- include the regex that didn't match in the diagnostic

- ilmari
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