Pure Python script that saves an HTML page with all images
Your code is pretty good! I do have a few tips regarding style, and such.


As mentioned in the comments, even though it looks like you aren't, you shouldn't be trying to parse HTML with Regexes.
Where are your comments? While good code can be pretty readable, comments are still a valuable asset. You should probably flesh out your page_loader function with a docstring, and any unclear blocks of code with an inline comment.
If you're only going to use part of a module, e.g, one function or variable, you should do from ... import ....


That's about all I can really think of right now. If there's anything else you want me to comment on, just mention it below, and I'll see if I can cover it. Hope this helps!