[Issue 7962] New: std.regex: Captures.length() returns incorrect value

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7962

           Summary: std.regex: Captures.length() returns incorrect value
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: markusle at gmail.com


--- Comment #0 from Markus Dittrich <markusle at gmail.com> 2012-04-21 13:14:03 PDT ---
It seems that Captures.length() from std.regex returns bogus lengths for empty
captures (I might be using it improperly). Here's a simple example, the second
match object claims length 2 while being empty.

sh-4.2$ uname
Linux

sh-4.2$ dmd | grep "DMD"
DMD64 D Compiler v2.059

sh-4.2$ cat test.d 
import std.regex;
import std.stdio;

int main() {

  auto r = regex(r"(@\w+)", "g");

  writeln("match first string  -- looks ok");
  string text1 = "@This is a test";
  auto m1 = match(text1, r);
  auto myCapts1 = m1.captures;
  writeln("content:  ", myCapts1);
  writeln("is empty? ", myCapts1.empty());
  writeln("length:   ", myCapts1.length());

  writeln("");
  writeln("match second string -- length seems wrong");
  string text2 = "(his) is a test";
  auto m2 = match(text2, r);
  auto myCapts2 = m2.captures;
  writeln("content:  ", myCapts2);
  writeln("is empty? ", myCapts2.empty());
  writeln("length :  ", myCapts2.length());

  return 0;
}

sh-4.2$ dmd test.d 
sh-4.2$ ./test 
match first string  -- looks ok
content:  ["@This", "@This"]
is empty? false
length:   2

match second string -- length seems wrong
content:  []
is empty? true
length :  2

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