[Issue 9979] Regex bug

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9979



--- Comment #1 from Diggory <diggsey at googlemail.com> 2013-04-22 19:15:38 PDT ---
I've narrowed it down to what seems to be an off-by-one error in the regex
engine when a word break is encountered while the current string position is at
the end of the string.

This much simpler regex demonstrates the problem:
    auto r = regex(r"A\b", "g");

    string s = "A";
    auto m = s.match(r);

    writeln(m);

Clearly this should match "A" but it instead matches an empty string before A.

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