Given that context, you might want to try something like this technique (untested):
while (defined($file = readdir(DIR))) {
next unless $file =~ /^(abc)(\d{1,3})(\.html)$/;
rename "$dirname/$file" "$dirname/" . $1 . "0" x (4 - length $2) .
+ $2 . $3;
}
I'd also recommend that you try this with a print to ensure you're in the right directory and targetting the correct files before making thousands of changes; then change to rename. Some error checking/handling might also be useful.
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