The OP changed his question into:
How does that script work with all the # in it?
I assume this was ment to be a reply to this post, so I'll post my answer here.
The # in s#class=section#class="Section"#sg; for example is used as a regex-delimiter, not as a comment. It is the same as s/class=section/class="Section"/sg; except that with s/// you would need to escape the / (which could make it less readable, but that does not apply in this case since it has no / in the regex)
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