…exp.Regexp

This allows users to have full control over the pattern used for
matching, and all of its flags (multiline)

 - qt.ErrorMatches single-line match `expectedNegateFailure`
 - qt.ErrorMatches multi-line match `expectedNegateFailure`
 - qt.ErrorMatches multi-line match `expectedCheckFailure`
 - qt.PanicMatches single-line match `expectedNegateFailure`
 - qt.PanicMatches multi-line match `expectedNegateFailure`
 - qt.PanicMatches multi-line match `expectedCheckFailure`

…atches

Documentation added both to the checker.go file and the README.md file

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 3 to 4.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](actions/setup-go@v3...v4)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Using Not(DeepEquals) on a type with an unexported field currently
succeeds without an error. This is because the unexported field is
raised as a panic by go-cmp, which is turned into a plain error by
the library. Not then interprets the error to mean "not equal" instead
of forwarding it to the user.

Fix this by turning any go-cmp panics into a bad check.

Fixes #153

Allow Matches and ErrorMatches matches to use an already-compiled regexp.Regexp

…ns/setup-go-4

Bump actions/setup-go from 3 to 4

Turn a panicking cmp.Diff into a bad check

Only keep the refernce to the original satisfies code