[Issue 15489] New: regex - match/matchAll and bmatch - different output

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15489

          Issue ID: 15489
           Summary: regex - match/matchAll and bmatch - different output
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: gassa at mail.ru

I want to test for the pattern "two consecutive characters, arbitrary sequence,
the same two consecutive characters".  My pattern is r"(..).*\1".  It works
with bmatch but not with match/matchAll.  A complete example follows.

import std.regex, std.stdio;
void main ()
{
    writeln (bmatch   ("abab",  r"(..).*\1"));  // [["abab", "ab"]]
    writeln (match    ("abab",  r"(..).*\1"));  // [["abab", "ab"]]
    writeln (matchAll ("abab",  r"(..).*\1"));  // [["abab", "ab"]]
    writeln (bmatch   ("xabab", r"(..).*\1"));  // [["abab", "ab"]]
    writeln (match    ("xabab", r"(..).*\1"));  // []
    writeln (matchAll ("xabab", r"(..).*\1"));  // []
}

As you can see, bmatch (usage discouraged in the docs) gives me the result I
want, but match (also discouraged) and matchAll (way to go) don't.

Original thread in D.learn:
http://forum.dlang.org/thread/lqjffwcpzayznqljxsuu@forum.dlang.org.  No one
replied so far, so I assume this is a bug.

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