Freshen std.regex ddoc, plus link our regex article
fix

forgot a test

whitespace formatting

some more nitpick fixes

one more consistency test

spelling

starting -> ending
Merge pull request #1330 from burner/lastIndexOf

lastIndexOf width startIdx
Merge pull request #1469 from blackwhale/regex-docs

Freshen std.regex ddoc, plus link our regex article
Remove conflict template function

By fixing bug 10811, both toUTFz template functions will conflict on the call `toUTFz!(T)(str)`. Remove one to resolve ambiguity.