Regular Expression Anamoly

[luvsoumen]

Hi,

I need to pick files of the format "REUSE_212_001_20080519_1.txt" from a specified directory with a condition that the alphabets used in the pattern 'REUSE' can be in any case.

To implement this logic in my shell script, I am using a regular expression as mentioned in the below scriptlet;
for filename in `ls ${1}\[Rr][Ee][Uu][Ss][Ee]_[0-9][0-9][0-9]_0[0-1]1_[1-2][0-9][0-9][0-9][0-1][0-9][0-3][0-9]_[1-9].txt`
do
echo $filename
done

This gives me the output /export/home/schatter/FTP_scripts/report/[Rr][Ee][Uu][Ss][Ee]_[0-9][0-9][0-9]_0[0-1]1_[1-2][0-9][0-9][0-9][0-1][0-9][0-3][0-9]_[1-9].txt: No such file or directory

Whereas,

Listing the file with cat command using this regular expression gives me the file contents as mentioned below;

cat /export/home/schatter/FTP_scripts/report/[Rr][Ee][Uu][Ss][Ee]_[0-9][0-9][0-9]_0[0-1]1_[1-2][0-9][0-9][0-9][0-1][0-9][0-3][0-9]_[1-9].txt

gives the output
000198,17May2009-05:49:27,000000004
07000000058,17May2009-04:00:02,22909
07000000059,17May2009-04:00:02,22909
07000000060,17May2009-04:00:02,22909
07000000061,17May2009-04:00:02,22909
END_OF_DATA

Can anyone please suggest me the reason and the description of this behavior ?

Thanking in anticipation.

-Soumen.

[secondmouse]

There is a little problem in your script:
for filename in `ls ${1}\[Rr][Ee][Uu]
should be
for filename in `ls ${1}/[Rr][Ee][Uu]