Thanks Dave for your reply.I will change my regular expressions and try capturing required files.

Actual output i want is an xml file that lists all the files ending with .swtag,.sys,.sys2 and .cmptag with their sizes and their full paths.

Actual output i am getting is an empty xml file with beginning and ending tags.That means,files which i need are compressed with in zip file and tar files.After uncompressing those archives using File::Find module,my desired files are not reported to the xml file.