You could do it all with a regex, a bit like this...
use strict;
use warnings;
while (<DATA>) {
print unless /[^,]+,\d+,([^.]+\.){2}[^,.]+/;
}
__DATA__
cls1,37,Media.vdenc.abcunit,media_vd
cls2,7,Media.Wigig.plsunit,media_vd
cls3,27,Media.vdenc,media_vd
cls4,47,Media.hevc,media_vd
cls5,57,Media.ENC,media_vd
Output
cls3,27,Media.vdenc,media_vd
cls4,47,Media.hevc,media_vd
cls5,57,Media.ENC,media_vd
Though that is not the most readable way :)
Cheers,
R.
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