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PORegular expression to catch as many Javascript redirections as possible
 

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  1. PORegular expression to catch as many Javascript redirections as possible
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    <p>I'm trying to catch as many Javascript redirects as possible from many HTML pages. My regular expression is:</p> <pre><code>((location.href)|(window.location)|(location.replace)|(location.assign))(( ?= ?)|( ?\( ?))("|')([^'"]*)("|')( ?\) ?)?; </code></pre> <p>I use Python but the question is general:</p> <pre><code>regex = re.compile(r"""((location.href)|(window.location)|(location.replace)|(location.assign))(( ?= ?)|( ?\( ?))("|')([^'"]*)("|')( ?\) ?)?;""", re.I) # ... some control here ... print re.search(regex, html).group(10) # 10 is the pure url </code></pre> <p>I did some tests and I was able to catch all these cases.</p> <pre><code>location.href = "http://www.foo.com"; location.href="http://www.foo.com"; window.location = "http://www.foo.com"; window.location.href = "http://www.foo.com"; location.replace ("http://www.foo.com"); location.replace( "http://www.foo.com" ) ; location.assign ("http://www.foo.com"); </code></pre> <p>And skip where I can't resolve an URL because the code contains a variable:</p> <pre><code>location.href = "http://www.foo.com" + var + "something else"; </code></pre> <p>The questions are:</p> <ol> <li>Are there other ways to redirect using Javascript? Other <code>location.somethingelse</code> that I am missing?</li> <li>Is the way I catch these 4 cases correct? Is it allowed to have something like <code>location.href = http://www.foo.com;</code> or <code>location.replace (http://www.foo.com);</code> that I'll miss because of the (double) quotes? Am I too strict or too lax?</li> <li>Is my regex well written? Or can I improve it in some way?</li> </ol>
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    1. COThere's also `document.location`
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      1. USmrk
    2. COThanks, I forgot that!
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    3. COThe URL should be between double quotes OR single quotes. You'll need to check for both since they are both valid ways to enclose a string in JavaScript.
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      1. PORegular expression to catch as many Javascript redirections as possible
      1. USMatt Burland
 

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