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PORegular Expression in gVim to Remove Duplicate Domains from a List
 

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  1. PORegular Expression in gVim to Remove Duplicate Domains from a List
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    <p>I need a regular expression written to use in gVim that will remove duplicate domains from a list of URLs (gVim can be downloaded here: <a href="http://www.vim.org/download.php" rel="nofollow">http://www.vim.org/download.php</a></p> <p>I have a list of over 6,000,000 URLs in a .txt file (which opens in gVim for editing).</p> <p>The URLs are in this format:</p> <pre class="lang-none prettyprint-override"><code>http://www.example.com/some-url.php http://example2.com/another_url.html http://example3.com/ http://www.example4.com/anotherURL.htm http://www.example.com/some-url2.htm http://example.com/some-url3.html http://www.example2.com/somethingelse.php http://example5.com </code></pre> <p>In other words, there is no specific format to the URLs. Some have the WWW, some don't, they all have different formats.</p> <p>I need a regular expression written for gVim that will remove all duplicate DOMAINs from the list (and it's corresponding URL), leaving behind the first instance it finds.</p> <p>So it would take the example list posted above, and the end result should look like this:</p> <pre class="lang-none prettyprint-override"><code>http://www.example.com/some-url.php http://example2.com/another_url.html http://example3.com/ http://www.example4.com/anotherURL.htm http://example5.com </code></pre> <p>Here are two nice sites that explain how to use regular expressions within gVim pretty nicely:</p> <p><a href="http://supportweb.cs.bham.ac.uk/documentation/tutorials/docsystem/build/tutorials/gvim/gvim.html#Vi-Regular-Expressions" rel="nofollow">http://supportweb.cs.bham.ac.uk/documentation/tutorials/docsystem/build/tutorials/gvim/gvim.html#Vi-Regular-Expressions</a></p> <p><a href="http://www.softpanorama.org/Editors/Vimorama/vim_regular_expressions.shtml" rel="nofollow">http://www.softpanorama.org/Editors/Vimorama/vim_regular_expressions.shtml</a></p>
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    1. COCan you show us some examples of what you've tried so far? One trick for finding/removing duplicates that I've found is to sort the list, first. It's a huge file, so that might be a difficult option for you, but it might also make your regex much simpler.
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    2. COgVim actually has a very nice feature built in for sorting the URLs, so that's no problem at all. I simply type the following & press enter :sort u That sorts all the lines alphabetically, and then removes duplicate LINES (not domains). As for showing some examples, I haven't gotten very far. Here is one (that I got from this site actually, but gVim says that it isn't a recognized command or regular expression) http://stackoverflow.com/questions/2280666/remove-duplicate-domains-from-list-with-regular-expressions
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    3. COaccording to gvim's documentation the format to enter what you're looking to do, should be in this format: :start_point,end_points/search_pattern/replacement_pattern/g and this URL gives some simple examples http://147.188.192.43/documentation/tutorials/docsystem/build/tutorials/gvim/gvim.html#Vi-Regular-Expressions ...but my knowledge of regex is nothing at all...until today, I hadn't even heard of it.
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