Use of regular expression

Shell Programming and Scripting
1

Hi,

Earlier I was using the below expression to identify the file names

ls PRODUCT_LIST_[IG][EB]_CITIES_????????.dat

file names :

PRODUCT_LIST_GB_CITIES_????????.dat
PRODUCT_LIST_IE_CITIES_????????.dat

but now the file names have been changed as below

PRODUCT_LIST_UK_CITIES_????????.dat
PRODUCT_LIST_ROI_CITIES_????????.dat

How can i modify this existing reg expression for the new requirement

2 
$
$
$ ls -1 PRODUCT_LIST_[UR][KO]*_CITIES_????????.dat
PRODUCT_LIST_ROI_CITIES_12345678.dat
PRODUCT_LIST_UK_CITIES_12345678.dat
$
$

tyler_durden