Linux rename with a variable character?

I have a list of files eg.

page-1.htm
page-2.htm
page-32.htm

How do I use rename to be like this:

page-01.htm
page-02.htm
page-32.htm

I am new to this and having trouble understanding the examples online. I want to do something like the following where the ? is a variable character:

rename 's/page-?.htm$/page-0?.htm/' *

Answer

? mean “any character”.

So, your page-1.htm will be rename because it’s match with pattern page-?.htm but page-32.htm don’t

for your problem, you can use find | replace method, like this:

find -name 'page_?.htm' | rename 's/page_/page_0/'

I know it’s doesn’t what you really want, but it’s temp solution