[Tutor] Extracting comments from a file

[Lao Mao]

Hi,

I have an html file, with xml style comments in:

<!--
Some comments here
Blah
...
-->

I'd like to extract only the comments.  My sense of smell suggests that
there's probably a library (maybe an xml library) that does this already.
Otherwise, my current alogorithm looks a bit like this:

* Iterate over file
* If current line contains <!---
  - Toggle 'is_comment' to yes
* If is_comment is yes, print the line
* If current line contains -->
  - Toggle 'is_comment' to no

This feels crude, but is it effective, or ok?

Thanks,

Laomao
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