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[Martin Pool <mbp@xxxxxxxxxxxxxx>]

** Branch unlinked: lp:~mbp/bzr/704195-plugin-warnings

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https://bugs.launchpad.net/bugs/704219

Title:
  wish for invertible matchers

Status in testtools:
  New

Bug description:
  I can define ContainsRegexp(r'\d+') and match against it, and then
  also say Not(ContainsRegexp(r'\d+')) and this works. However, in the
  latter case, what I'd really like to get is something like

    "unexpectedly matched '\\d+' in 'route66' at '66'"

  rather than just being told the matcher passed successfully.

  I can just define NotContainsRegexp that has the same behavior but
  gives better mismatches.  But I wonder if this should fall out in a
  cleaner way.