[Issue 10799] New: std.regex: ctRegex lookahead support

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10799

           Summary: std.regex: ctRegex lookahead support
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: dmitry.olsh at gmail.com


--- Comment #0 from Dmitry Olshansky <dmitry.olsh at gmail.com> 2013-08-11 13:20:30 PDT ---
Yet another unimplemted corner of ctRegex.
Some test cases, basically the same full unrestricted lookahead must be
supported.

import std.algorithm, std.regex;

void main()
{
    auto c1 = ctRegex!("a(?=bc)b");
    assert("abc".match(c1).equal!equal([["ab"]]));
    assert("ab".match(c1).empty);
    auto c2 = ctRegex!("a(?![a-z]*!)b");
    assert("ab".match(c2).equal!equal([["ab"]]));
    assert("ab!".match(c2).empty);
    assert("abcd!".match(c2).empty);
    assert("abcd5!".match(c2).equal!equal([["ab"]]));
}

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