G'day taint,
Here's another way to do it:
$ perl -Mstrict -Mwarnings -E '
my @files = qw{abc1.html abc12.html abc123.html abc1234.html};
say for map {
s/^(abc)(\d{1,3})(\.html)$/$1 . "0" x (4 - length $2) . $2 . $
+3/e; $_
} @files;
'
abc0001.html
abc0012.html
abc0123.html
abc1234.html
Update:
"... the files begin with the same 3 alpha characters ..." so \w{3} is far too generic:
s/\w{3}/abc/
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