Allow hyphen in raster refercnes

git-svn-id: http://svn.osgeo.org/qgis/trunk@14694 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/analysis/raster/qgsrastercalclexer.ll

@@ -45,7 +45,7 @@ num2    {dig}*\.{dig}+([eE][-+]?{dig}+)?
 number  {num1}|{num2}
 
 non_ascii    [\x80-\xFF]
-raster_ref_char  [A-Za-z0-9_]|{non_ascii}
+raster_ref_char  [A-Za-z0-9_]|{non_ascii}|[-]
 raster_band_ref ({raster_ref_char}+)@{dig}
 
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