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    <p>Terribly sorry, couldn't help it. :s</p> <h3>url.hh</h3> <pre><code>#ifndef URL_HH_ #define URL_HH_ #include &lt;string&gt; struct url { url(const std::string&amp; url_s); // omitted copy, ==, accessors, ... private: void parse(const std::string&amp; url_s); private: std::string protocol_, host_, path_, query_; }; #endif /* URL_HH_ */ </code></pre> <h3>url.cc</h3> <pre><code>#include "url.hh" #include &lt;string&gt; #include &lt;algorithm&gt; #include &lt;cctype&gt; #include &lt;functional&gt; using namespace std; // ctors, copy, equality, ... void url::parse(const string&amp; url_s) { const string prot_end("://"); string::const_iterator prot_i = search(url_s.begin(), url_s.end(), prot_end.begin(), prot_end.end()); protocol_.reserve(distance(url_s.begin(), prot_i)); transform(url_s.begin(), prot_i, back_inserter(protocol_), ptr_fun&lt;int,int&gt;(tolower)); // protocol is icase if( prot_i == url_s.end() ) return; advance(prot_i, prot_end.length()); string::const_iterator path_i = find(prot_i, url_s.end(), '/'); host_.reserve(distance(prot_i, path_i)); transform(prot_i, path_i, back_inserter(host_), ptr_fun&lt;int,int&gt;(tolower)); // host is icase string::const_iterator query_i = find(path_i, url_s.end(), '?'); path_.assign(path_i, query_i); if( query_i != url_s.end() ) ++query_i; query_.assign(query_i, url_s.end()); } </code></pre> <h3>main.cc</h3> <pre><code>// ... url u("HTTP://stackoverflow.com/questions/2616011/parse-a.py?url=1"); cout &lt;&lt; u.protocol() &lt;&lt; '\t' &lt;&lt; u.host() &lt;&lt; ... </code></pre>
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    1. POEasy way to parse a url in C++ cross platform?
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    1. COMinor nitpick: You don't need to use ptr_fun here, and if you do, you need to `#include <functional>`. (you probably shouldn't `using namespace std` either but I'm assuming this isn't for production code)
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      1. USBilly ONeal
    2. COI omitted some trivial functionality, like the assignment operator, constructors, accessors and so on. The `url` class shouldn't have mutators. For the equality operator, you might add a hash member that you fill in while parsing the original string. Then, comparing two urls for equality should be very fast. It also means some extra complexity; it's your call.
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    3. CO@Billy I always bring namespace `std` into my compilation units (not the headers!). I think it's perfectly fine, and I think that having `std::` all over the place poses more pollution and eye-fatigue than bringing in the namespace.
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