C++之BOOST字符串查找示例(2)

#include <string> 
#include <iostream> 
#include <iterator> 
//#include <boost/algorithm/string/replace.hpp> 
//#include <boost/algorithm/string/erase.hpp> 
//#include <boost/algorithm/string/case_conv.hpp> 
#include <boost/algorithm/string.hpp> 
 
//Following two includes contain second-layer function. 
//They are already included by first-layer header 
 
//#include <boost/algorithm/string/replace2.hpp> 
//#include <boost/algorithm/string/find2.hpp> 
 
using namespace std; 
using namespace boost; 
 
// uppercase formatter 
/* 
    Convert an input to upper case.  
    Note, that this formatter can be used only on std::string inputs. 
*/ 
inline string upcase_formatter(  
    const iterator_range<string::const_iterator>& Replace ) 
{ 
    string Temp(Replace.begin(), Replace.end()); 
    to_upper(Temp); 
    return Temp; 
} 
 
int main() 
{   
    cout << "* Replace Example *" << endl << endl; 
 
    string str1("abc___cde___efg"); 
 
    // Erase 6-9th characters from the string 
    cout << "str1 without 6th to 9th character:" << 
        erase_range_copy( str1, make_iterator_range(str1.begin()+6, str1.begin()+9) ) << endl; 
 
    // Replace 6-9th character with '+++' 
    cout << "str1 with 6th to 9th character replaced with '+++': " <<  
        replace_range_copy(  
            str1, make_iterator_range(str1.begin()+6, str1.begin()+9), "+++" ) << endl; 
 
    cout << "str1 with 'cde' replaced with 'XYZ': "; 
     
    // Replace first 'cde' with 'XYZ'. Modify the input 
    replace_first_copy( ostream_iterator<char>(cout), str1, "cde", "XYZ" ); 
    cout << endl; 
     
    // Replace all '___' 
    cout << "str1 with all '___' replaced with '---': " <<  
        replace_all_copy( str1, "___", "---" ) << endl; 
 
    // Erase all '___' 
    cout << "str1 without all '___': " <<  
        erase_all_copy( str1, "___" ) << endl; 
 
    // replace third and 5th occurrence of _ in str1 
    // note that nth argument is 0-based 
    replace_nth( str1, "_", 4, "+" ); 
    replace_nth( str1, "_", 2, "+" ); 
 
    cout << "str1 with third and 5th occurrence of _ replace: " << str1 << endl; 
 
    // Custom formatter examples 
    string str2("abC-xxxx-AbC-xxxx-abc"); 
 
    // Find string 'abc' ignoring the case and convert it to upper case 
    cout << "Upcase all 'abc'(s) in the str2: " << 
        find_format_all_copy(  
            str2, 
            first_finder("abc", is_iequal()),  
            upcase_formatter ); 
     
    cout << endl; 
 
    return 0; 
}