87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
/*
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*
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* Copyright (c) 1998-2002
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* John Maddock
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*
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0. (See accompanying file
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* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*
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*/
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/*
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* LOCATION: see http://www.boost.org for most recent version.
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* FILE regex_split_example_2.cpp
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* VERSION see <boost/version.hpp>
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* DESCRIPTION: regex_split example: spit out linked URL's.
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*/
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#include <boost/regex.hpp>
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#include <list>
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#include <fstream>
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#include <iostream>
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#include <iterator>
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boost::regex e("<\\s*A\\s+[^>]*href\\s*=\\s*\"([^\"]*)\"",
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boost::regex::normal | boost::regbase::icase);
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void load_file(std::string& s, std::istream& is)
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{
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s.erase();
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if(is.bad()) return;
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//
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// attempt to grow string buffer to match file size,
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// this doesn't always work...
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s.reserve(static_cast<std::string::size_type>(is.rdbuf()->in_avail()));
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char c;
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while(is.get(c))
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{
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// use logarithmic growth stategy, in case
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// in_avail (above) returned zero:
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if(s.capacity() == s.size())
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s.reserve(s.capacity() * 3);
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s.append(1, c);
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}
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}
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int main(int argc, char** argv)
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{
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std::string s;
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std::list<std::string> l;
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int i;
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for(i = 1; i < argc; ++i)
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{
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std::cout << "Findings URL's in " << argv[i] << ":" << std::endl;
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s.erase();
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std::ifstream is(argv[i]);
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load_file(s, is);
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is.close();
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boost::regex_split(std::back_inserter(l), s, e);
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while(l.size())
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{
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s = *(l.begin());
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l.pop_front();
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std::cout << s << std::endl;
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}
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}
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//
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// alternative method:
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// split one match at a time and output direct to
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// cout via ostream_iterator<std::string>....
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//
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for(i = 1; i < argc; ++i)
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{
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std::cout << "Findings URL's in " << argv[i] << ":" << std::endl;
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s.erase();
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std::ifstream is(argv[i]);
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load_file(s, is);
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is.close();
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while(boost::regex_split(std::ostream_iterator<std::string>(std::cout), s, e, boost::match_default, 1)) std::cout << std::endl;
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}
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return 0;
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}
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