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use strict;
use warnings;
...
test1.file1.new_20060411.zip
test2.file2.new_20060411.zip
test3.file3.new_20060411.zip

Change: test0.file0.new_20060411.zip to test0_file0_new_20060411.zip
Change: test1.file1.new_20060411.zip to test1_file1_new_20060411.zip
Change: test2.file2.new_20060411.zip to test2_file2_new_20060411.zip
Change: test3.file3.new_20060411.zip to test3_file3_new_20060411.zip