HTML::Defang uses a custom html tag parser. The parser has been designed and tested to work with nasty real world html and to try and emulate as close as possible what browsers actually do with strange looking constructs. The test suite has been built based on examples from a range of sources such as http://ha.ckers.org/xss.html and http://imfo.ru/csstest/css_hacks/import.php to ensure that as many as possible XSS attack scenarios have been dealt with.
We only allow XHTML to be saved, it is validated before saved. All problems are solved this way. The WYSIWYG-editor only allows valid XHTML to be created.
Standard parsers for X(HT)ML are avalaible in masses and are rock-stable. Of course wandering through the DOM is not as easy as thought at first glance, but once you understand the subtleties, the knowledge is useful on many tasks. The resulting code using this approach leads to performant, safe and correct apps.
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What HTML are you parsing? Your own, someone you knows, or a whole engine for spidering? The first two could get away with regex, the last two Iâm not so sure.
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âThe only crime being perpetrated is not knowing what the alternatives are.â
I commit this crime regularly. In some cases, thereâs just so many options for everything you could think of doing⌠sometimes picking the âright oneâ for the job takes longer than picking the first and hacking up a solution.
Havenât you ever heard of CGIProxy, Glype, or PHProxy? These do exceptionaly well mirroring websites, Specially Glype and CGIProxy, by modifying the html with Regexes.
You guys are just quitters⌠I parse HTML with Regular Expressions all the time. The trick is to do it in two passes. The first pass extracts the tag, the second pass processes the tag. I use this approach in PHP to import external web pages into a CMS together with all their referenced stylesheets, images, media, and javascript files. It also recursively parses the stylesheet external file references.
Actually now that I think about it, this is kind of a compromise since I use individual RegExâs for each tag. In other words its a kind of halfway house between a pure hand-crafted heuristic and a more orthogonal approach⌠This is probably the way the HTML parsing libraries do it anyway.
Parsing html with regular expressions = bad idea granted, but locating something specific within html with regex = good idea. Want to find A tags: use regex. Want to locate images: use regex. Want to apply XSLT to html for the purpose of converting it to an RSS feed: Use dedicated parser. Html Agility pack, Tidy, System.Html all fine parsers, all easy to use 99% of the result with 1% of the effort.
âA good artist copies. A great artist stealsâ. Leverage an API!
Itâs not really about using regex vs some other parsing method, its really just about the cohesion between the search mechanism and the rest of the software.
Regex has its place as a simple search mechanism. Itâs easy to implement and generally gets the job in a productive fashion. If the searching is complex, then a different mechanism should be used.
The only thing that would irk me is if the searching function call was located deep within a 1000 line module. I wouldnât care at all if I had to replace a single search class.
If the project had unit tests, that makes replacing the algorithm even easier.
Iâm posting the Cthuluhu picture on my wall at work anyway.