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POFind All URL That Is Not An HTML Attribute or Content of A Hyperlink Tag
 

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    <p>I'm trying to figure out a regex that matches all URL that are not an attribute of an element or is a content of a hyperlink.</p> <p>Should match:</p> <pre><code> 1. This is a url http://www.google.com </code></pre> <p>Should not match:</p> <pre><code> 1. &lt;a href="http://www.google.com"&gt;Google&lt;/a&gt; 2. &lt;a href="http://www.google.com"&gt;http://www.google.com&lt;/a&gt; 3. &lt;img src="http://www.google.com/image.jpg"&gt; 4. &lt;div data-url="http://www.google.com"&gt;&lt;/div&gt; </code></pre> <p>I'm currently using this regex to match all URL and I think I know what I have to detect, but I just can't figure out using regex.</p> <pre><code>\\b(https?|ftp|file)://[-a-zA-Z0-9+&amp;@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&amp;@#/%=~_|] </code></pre> <hr> <p><strong>EDITED</strong></p> <p>What I'm trying to achieve is the following. I want to convert this string.</p> <pre><code>This is a url http://www.google.com &lt;a href="http://www.google.com" title="Go to Google"&gt;Google&lt;/a&gt;&lt;a href="http://www.google.com"&gt;http://www.google.com&lt;/a&gt;&lt;img src="http://www.google.com/image.jpg"&gt;&lt;div data-url="http://www.google.com"&gt;&lt;/div&gt; </code></pre> <p>To</p> <pre><code>This is a url &lt;a href="http://www.google.com"&gt;http://www.google.com&lt;/a&gt; &lt;a href="http://www.google.com" title="Go to Google"&gt;Google&lt;/a&gt;&lt;a href="http://www.google.com"&gt;http://www.google.com&lt;/a&gt;&lt;img src="http://www.google.com/image.jpg"&gt;&lt;div data-url="http://www.google.com"&gt;&lt;/div&gt; </code></pre> <p>Preprocessing by removing tags and then put them back doesn't solve the problem since actually ends up removing all data attributes of the existing hyperlink elements. It also doesn't solve the issue when there are other URL using in other attributes beside href.</p> <p>So far, I haven't found a solution suggested by anyone and so far I also haven't found a way to do this using HTML parser. It's actually seem more doable using regex.</p> <hr> <p><strong>EDITED 2</strong></p> <p>After the attempt based on Dean's suggestion, I'm about ready to rule out HTML parser from being able to achieve this for it inability to process string without making it a valid HTML document. Here's the code based on the suggested example + the fix to handle exclusion case 2.</p> <pre><code> Document doc = Jsoup.parseBodyFragment(htmlText); final List&lt;TextNode&gt; nodesToChange = new ArrayList&lt;TextNode&gt;(); NodeTraversor nd = new NodeTraversor(new NodeVisitor() { @Override public void tail(Node node, int depth) { if (node instanceof TextNode) { TextNode textNode = (TextNode) node; Node parent = node.parent(); if(parent.nodeName().equals("a")){ return; } String text = textNode.getWholeText(); List&lt;String&gt; allMatches = new ArrayList&lt;String&gt;(); Matcher m = Pattern.compile("\\b(https?|ftp|file)://[-a-zA-Z0-9+&amp;@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&amp;@#/%=~_|]") .matcher(text); while (m.find()) { allMatches.add(m.group()); } if(allMatches.size() &gt; 0){ nodesToChange.add(textNode); } } } @Override public void head(Node node, int depth) { } }); nd.traverse(doc.body()); </code></pre> <p>This code adds HTML, HEAD and BODY tag to the result. The only hack I can think of around this issue is to check whether HTML, HEAD and BODY tags exist in the string. If not, stripe them out after processing.</p> <p>I hope someone else has a better suggestion than this hack. Using JSOUP is already very expensive in terms of processing time so I really don't want to add more overhead if I don't have to.</p>
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    1. CO*"but I just can't figure out using regex."* RegEx was never meant to parse HTML. Use an HTML parser. http://stackoverflow.com/q/1732348/418556
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    2. CORegular expressions are a powerful formalism, but they are not well suited for extracting data from html or XML. You should be using an XML Query language such as XQuery, XPath or XSLT or an XML API such as SAX within a pre-processing step. In this preprocessing step you could get rid of all attributes and anchor tags. If your html is not well-formed you will have to use an HTML cleaner in another preprocessing step.
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    3. CO@AndrewThompson I'm actually fine with using HTML parser also. The how would you approach it. Let's say I have this string "This is a url http://www.google.com <a href="http://www.google.com">Google</a><a href="http://www.google.com">http://www.google.com</a><img src="http://www.google.com/image.jpg"><div data-url="http://www.google.com"></div>". Everyone kept suggesting using HTML/XML parser, but no one has suggested a way to solve this. XML parser can't be used here since it's not a well-formed XML. With HTML parser, I still need to find a way to process it.
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