html-content-extraction

I need to read data from an online database that's displayed using an aspx page from the UN. I've done HTML parsing before, but it was always by manipulating query-string values. In this case, the site uses asp.net postbacks. So, you click on a value in box one, then box two shows, click on a value in box 2 and click a button to get your results. Does anybody know how I could automate that process? Thanks, Mike You may still only need to send one request, but that one request can be rather complicated. ASP.Net is notoriously difficult (though not impossible) to screen scrape. Between event

I'm trying to write a regular expression for my html parser. I want to match a html tag with given attribute (eg. <div> with class="tab news selected" ) that contains one or more <a href> tags. The regexp should match the entire tag (from <div> to </div> ). I always seem to get "memory exhausted" errors - my program probably takes every tag it can find as a matching one. I'm using boost regex libraries. Chas. Owens You may also find these questions helpful: Can you provide some examples of why it is hard to parse XML and HTML with a regex? Can you provide an example of parsing HTML with your

I'd like to read the contents of a URL (e.q., http://www.haaretz.com/ ) in R. I am wondering how I can do it Shane Not really sure how you want to process that page, because it's really messy. As we re-learned in this famous stackoverflow question , it's not a good idea to do regex on html, so you will definitely want to parse this with the XML package. Here's an example to get you started: require(RCurl) require(XML) webpage <- getURL("http://www.haaretz.com/") webpage <- readLines(tc <- textConnection(webpage)); close(tc) pagetree <- htmlTreeParse(webpage, error=function(...){},

I'm working on a program that downloads HTML pages and then selects some of the information and write it to another file. I want to extract the information which is intbetween the paragraph tags, but i can only get one line of the paragraph. My code is as follows; FileReader fileReader = new FileReader(file); BufferedReader buffRd = new BufferedReader(fileReader); BufferedWriter out = new BufferedWriter(new FileWriter(newFile.txt)); String s; while ((s = br.readLine()) !=null) { if(s.contains("<p>")) { try { out.write(s); } catch (IOException e) { } } } i was trying to add another while loop,

I want to parse some HTML in order to find the values of some attributes/tags etc. What HTML parsers do you recommend? Any pros and cons? NekoHTML , TagSoup , and JTidy will allow you to parse HTML and then process with XML tools, like XPath. I have tried HTML Parser which is dead simple. Do you need to do a full parse of the HTML? If you're just looking for specific values within the contents (a specific tag/param), then a simple regular expression might be enough, and could very well be faster. 来源： https://stackoverflow.com/questions/26638/what-html-parsing-libraries-do-you-recommend-in-java

I would like to extract from a general HTML page, all the text (displayed or not). I would like to remove any HTML tags Any javascript Any CSS styles Is there a regular expression (one or more) that will achieve that? You can't really parse HTML with regular expressions. It's too complex. RE's won't handle <![CDATA[ sections correctly at all. Further, some kinds of common HTML things like <text> will work in a browser as proper text, but might baffle a naive RE. You'll be happier and more successful with a proper HTML parser. Python folks often use something Beautiful Soup to parse HTML and