我可以在目标页面上解析HTML并跳转到其中的链接吗？

Question

The short version of my question is whether code can be written so that, instead of opening a page, it parses that page and opens a link on it instead? I've read a little bit about using PHP or Perl or other tools to parse HTML; is this something that could be done with tools like that?

I maintain some pages that include links to a fixed list of language-specific documents. The format is consistent along the lines of this (in generic fashion) with the line commented out if that document is not yet posted:

<ul>
    <li><a href="(en_US link)">English</a></li>
    <!-- <li><a href="(bg_BG link)">Bulgarian</a></li> --> 
    <!-- <li><a href="(zh_CN link)">Chinese - Simplified</a></li> --> 
    <li><a href="(zn_TW link)">Chinese - Traditional</a></li> 
    ... etc.
</ul>

Someone else has links to these pages.

Given one of these and knowing the language desired, could they find that link in the page and jump to it instead if that line is not commented out? Writing a regex would be easy because these embedded URLs all end with xx_XX.pdf using whatever the language/locale is.

I'm not trying to figure out what the code would be, just whether that's something one could write if they have the right tools and right knowledge.

Answer 1

You don't give very much detail, but yes, it sounds like this is possible

Traditionally, PHP is a server-side language while Perl is more often used on the client side. It would be a bad idea to implement this on a web server system, but if you are thinking of an HTTP client then it is feasible in pretty much any language

If you don't understand the distinction between client and server then please ask