To reuse some code...

$ perl -le'
$_ = "D.PRS.WEB.02.10.001.1";
print;
s/\.[^.]{0,2}\z//;
s/\.[^.]{4,}\z//;
print;
'

Will replace 0 to 2 or more than 3 characters with ""
To get digits and not "any character except a dot(.)" replace "[^.]"
with "[0-9]" or the equivalents: "\d" and "[:digits:]"

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