apt aptitude inconsistent search results (regex)

apt 0.8.16
aptitude 0.6.4

If I search for a package name (~n) then using '$' should prevent -dbg -doc
-multi.
So I would consider the following results wrong:
$ aptitude search "~ngstreamer(.+)-(ffmpeg|plugins-(ugly|bad))$"
i gstreamer0.10-ffmpeg - FFmpeg plugin for
GStreamer
p gstreamer0.10-ffmpeg-dbg - FFmpeg plugin for GStreamer (debug
symbols
i gstreamer0.10-plugins-bad - GStreamer plugins from the "bad"
set
p gstreamer0.10-plugins-bad-dbg - GStreamer plugins from the "bad" set
(debu
p gstreamer0.10-plugins-bad-doc - GStreamer documentation for plugins
from t
p gstreamer0.10-plugins-bad-multi - GStreamer plugins from the "bad" set
(Mult
p gstreamer0.10-plugins-bad-multi - GStreamer plugins from the "bad" set
(Mult
i gstreamer0.10-plugins-ugly - GStreamer plugins from the "ugly"
set
p gstreamer0.10-plugins-ugly-dbg - GStreamer plugins from the "ugly" set
(deb
p gstreamer0.10-plugins-ugly-doc - GStreamer documentation for plugins
from t

However, using the same regex with apt-cache yields the correct result:
$ apt-cache search "^gstreamer(.+)-(ffmpeg|plugins-(ugly|bad|good))$"
gstreamer0.10-ffmpeg - FFmpeg plugin for GStreamer
gstreamer0.10-plugins-bad - GStreamer plugins from the "bad" set
gstreamer0.10-plugins-ugly - GStreamer plugins from the "ugly" set
gstreamer0.10-plugins-good - GStreamer plugins from the "good" set

The only way I can get aptitude to perform properly is by using the
following regex:
$ aptitude search "~ngstreamer(.+)-(ffmpeg$|plugins-(ugly$|bad$|good$))"

Which I would consider as wrong.
Another example, where aptitude is right and apt-cache is wrong:
$ apt-cache search "^mp\w*r$"
mp3blaster - Full-screen console mp3 and Ogg Vorbis player
mp3roaster - A Perl hack for burning audio CDs out of MP3/OGG/FLAC/WAV files
mplayer2 - next generation movie player for Unix-like systems
mplayer - movie player for Unix-like systems

"mplayer2" should have been excluded.

$ aptitude search "~n^mp\w*r$"
p mp3blaster - Full-screen console mp3 and Ogg
Vorbis pla
p mp3roaster - A Perl hack for burning audio CDs out
of M
i mplayer - movie player for Unix-like systems

For package names, ~n or ?name with aptitude is unnecessary, I used it in
the previous examples for clarification.
I've read man 7 regex and I'm fairly sure those regexes are fine but many
instances give wrong results.
An application that gives expected results is grep, in particular grep -E.
Is this a known issue, or where am I going wrong?


apt 0.8.16<br>aptitude 0.6.4<br><br>If I search for a package name (~n) then using &#39;$&#39; should prevent -dbg -doc -multi.<br>So I would consider the following results wrong:<br><span style="font-family:courier new,monospace">$ aptitude search &quot;~ngstreamer(.+)-(ffmpeg|plugins-(ugly|bad))$&quot;</span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">i   gstreamer0.10-ffmpeg            - FFmpeg plugin for GStreamer               </span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">p   gstreamer0.10-ffmpeg-dbg        - FFmpeg plugin for GStreamer (debug symbols</span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">i   gstreamer0.10-plugins-bad       - GStreamer plugins from the &quot;bad&quot; set      </span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">p   gstreamer0.10-plugins-bad-dbg   - GStreamer plugins from the &quot;bad&quot; set (debu</span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">p   gstreamer0.10-plugins-bad-doc   - GStreamer documentation for plugins from t</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">p   gstreamer0.10-plugins-bad-multi - GStreamer plugins from the &quot;bad&quot; set (Mult</span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">p   gstreamer0.10-plugins-bad-multi - GStreamer plugins from the &quot;bad&quot; set (Mult</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">i   gstreamer0.10-plugins-ugly      - GStreamer plugins from the &quot;ugly&quot; set     </span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">p   gstreamer0.10-plugins-ugly-dbg  - GStreamer plugins from the &quot;ugly&quot; set (deb</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">p   gstreamer0.10-plugins-ugly-doc  - GStreamer documentation for plugins from t</span><br>
<br>However, using the same regex with apt-cache yields the correct result:<br><span style="font-family:courier new,monospace">$ apt-cache search &quot;^gstreamer(.+)-(ffmpeg|plugins-(ugly|bad|good))$&quot;</span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">gstreamer0.10-ffmpeg - FFmpeg plugin for GStreamer</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">gstreamer0.10-plugins-bad - GStreamer plugins from the &quot;bad&quot; set</span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">gstreamer0.10-plugins-ugly - GStreamer plugins from the &quot;ugly&quot; set</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">gstreamer0.10-plugins-good - GStreamer plugins from the &quot;good&quot; set</span><br>
<br>The only way I can get aptitude to perform properly is by using the following regex:<br><span style="font-family:courier new,monospace">$ aptitude search &quot;~ngstreamer(.+)-(ffmpeg$|plugins-(ugly$|bad$|good$))&quot;</span><br>
<br>Which I would consider as wrong.<br>Another example, where aptitude is right and apt-cache is wrong:<br><span style="font-family:courier new,monospace">$  apt-cache search &quot;^mp\w*r$&quot;</span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">mp3blaster - Full-screen console mp3 and Ogg Vorbis player</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">mp3roaster - A Perl hack for burning audio CDs out of MP3/OGG/FLAC/WAV files</span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">mplayer2 - next generation movie player for Unix-like systems</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">mplayer - movie player for Unix-like systems</span><br>
<br>&quot;mplayer2&quot; should have been excluded.  <br><br><span style="font-family:courier new,monospace">$  aptitude search &quot;~n^mp\w*r$&quot;</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">p   mp3blaster                      - Full-screen console mp3 and Ogg Vorbis pla</span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace">p   mp3roaster                      - A Perl hack for burning audio CDs out of M</span><br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace">i   mplayer                         - movie player for Unix-like systems  </span><br>
<br>For package names, ~n or ?name with aptitude is unnecessary, I used it in the previous examples for clarification.<br>I&#39;ve read man 7 regex and I&#39;m fairly sure those regexes are fine but many instances give wrong results.<br>
An application that gives expected results is grep, in particular grep -E.<br>Is this a known issue, or where am I going wrong?<br><br>



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