try:
(?<series>[\w]+)\s*(?<season>\d{4})x(?<episode>\d{1,2})
assuming 2008 is the "season"
if not, you can drop the season section.
try it out and let me know.
^[^\\$]+\\[^\\$]+\\((?<series>[^\\$$]+)( - ))((?<season>[\d]+)x(?<episode>[\d]+)([\s]+(?<episode2>[\d]+))?( - ))((?<title>[^\\$]*)( - ))(?<language>[^\\$]*)\.(?<ext>[^\\$]+)$
<Enabled>1<Format>x () fps<FormatAs>
<Enabled>1<Format>() , ()<FormatAs>
<Enabled>1<Format>V_MPEG4/ISO/AVC<FormatAs>H264
<Enabled>1<Format>MPA1L3<FormatAs>MP3
<Enabled>1<Format>MPA2L3<FormatAs>MP3
<Enabled>1<Format>V_MPEG2<FormatAs>MPEG2
<Enabled>1<Format>MPEG-2V<FormatAs>MPEG2
<Enabled>1<Format>DIV3<FormatAs>DIVX
<Enabled>1<Format>DX50<FormatAs>DIVX
<Enabled>1<Format>A_FLAC<FormatAs>FLAC
<Enabled>1<Format>A_AAC/MPEG4/LC/SBR<FormatAs>AAC
<Enabled>1<Format>A_AAC<FormatAs>AAC
<Enabled>1<Format>A_AC3<FormatAs>AC3
10/20/2008 6:37:57 PM - This Logofile does not exist..skipping: D:\Applications\MediaPortal\MediaPortal\skin\Black & White 1080\TVSeries_Logos\BlackSilver\Glas\Misc\V_MPEG4.png
10/20/2008 6:37:57 PM - This Logofile does not exist..skipping: D:\Applications\MediaPortal\MediaPortal\skin\Black & White 1080\TVSeries_Logos\BlackSilver\Glas\Misc\ISO.png
10/20/2008 6:37:57 PM - This Logofile does not exist..skipping: D:\Applications\MediaPortal\MediaPortal\skin\Black & White 1080\TVSeries_Logos\BlackSilver\Glas\Misc\AVC.png
<series>Greys Anatomy</series>
<season>02</season>
<episode>26</episode>
<episode2>27</episode2>
<title>Deterioration Of The Fight Or Flight Response, Losing My Religion</title>
<ext>avi</ext>