Enable a bunch of tests for std.net.isemail.

[jacob-carlborg]

These tests were previously commented out because of a bug
the regular expression module. Now when we have a new regular
expression module we can enable these tests.

This also fixed a bug in the internally used "substr" function.

[braddr]

The std.json parser is barfing on the json returned from github for this pull request: https://api.github.com/repos/D-Programming-Language/phobos/commits/f6e27e6f79a0831d4d5bb08300e722b40a4f23fd

I haven't dug into it, but I bet it's lines 1101 and 1102 of std.net.isemail.d.

Consequently, it won't be getting tested unless the problem gets fixed.

[jacob-carlborg]

Hmm, so the test suite is using std.json somehow to run the tests? According to http://jsonlint.com/ the JSON is valid so seems to be a bug in std.json. I'll see if there's something I can do about it.

[jacob-carlborg]

Create a pull request for std.json #1219.

[braddr]

The test suite, not at all (well, other than in unittests for the std.json module I assume). The tester infrastructure, yes. It necessarily interacts with github which uses json as it's encoding for data interchange.

[jacob-carlborg]

Cool the test suite is working again for this pull.