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