bug report in GREP

[gagan deep]

In First, i did 'll' i.e long listing which show all the file names in the 
current directory.
Next step, search for files of 08th month it show accurate data for this month 
of files and accurate for all other files , but it creates problem when i try 
to search for 06th month in the very last command.

i.e     ls -l | grep "[0-3][0-9][0][6]2006*"

[0-3] and [0-9]  -  represents day of the month like   08 , 17 
[0][6]  -  represents  month and only for this month , grep command gives wrong 
output
 
address@hidden testin]$ ll
total 0
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:31 01102006200959.txt
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 02112006200407.txt
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 07102006200242.txt
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:33 19062005154007.txt
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 19082005154007.txt
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 21092006200959.txt

address@hidden testin]$ ls -l | grep "[0-3][0-9][0][8]2006*"
 -rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 19082005154007.txt

address@hidden testin]$ ls -l | grep "[0-3][0-9][0][9]2006*"
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 21092006200959.txt

address@hidden testin]$ ls -l | grep "[0-3][0-9][1][0]2006*"
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:31 01102006200959.txt
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 07102006200242.txt
address@hidden testin]$ ls -l | grep "[0-3][0-9][1][1]2006*"
-rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 02112006200407.txt

address@hidden testin]$ ls -l | grep "[0-3][0-9][0][6]2006*"
 -rw-rw-r--    1 gagan    gagan           0 Nov  8 17:31 01102006200959.txt
 -rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 02112006200407.txt
 -rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 07102006200242.txt
 -rw-rw-r--    1 gagan    gagan           0 Nov  8 17:33 19062005154007.txt
 -rw-rw-r--    1 gagan    gagan           0 Nov  8 17:32 21092006200959.txt



Gagan
                                
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