Improve regex based tests

[fge]

Unfortunately, they all lead the user to believe that regexes are anchored. For instance, f.*o is used in patternProperties and corresponding member names are "fo", "fooo" or equivalent.

But in the context of JSON Schema, f.*o matches defoliation. Tests should be improved in that regard.

[Julian]

I deleted the last comment I sent because it was a total non-sequitur after reading your post again, sorry.

But yeah, you're right anyhow, we should generalize at least one of the examples to cover this behavior.

[geraintluff]

+1

[Julian]

Fixed in #24.