BOOST 字符串查找示例

BOOST  字符串查找示例

#include <string>#include <iostream>#include <algorithm>#include <functional>#include <boost/algorithm/string/case_conv.hpp>#include <boost/algorithm/string/find.hpp>using namespace std;using namespace boost;int main(){      cout << "* Find Example *" << endl << endl;    string str1("abc___cde___efg");    string str2("abc");    // find "cde" substring    iterator_range<string::iterator> range=find_first( str1, string("cde") );    // convert a substring to upper case     // note that iterator range can be directly passed to the algorithm    to_upper( range );    cout << "str1 with upper-cased part matching cde: " << str1 << endl;    // get a head of the string    iterator_range<string::iterator> head=find_head( str1, 3 );    cout << "head(3) of the str1: " << string( head.begin(), head.end() ) << endl;    // get the tail    head=find_tail( str2, 5 );    cout << "tail(5) of the str2: " << string( head.begin(), head.end() ) << endl;    // char processing    char text[]="hello dolly!";    iterator_range<char*> crange=find_last(text,"ll");    // transform the range ( add 1 )    transform( crange.begin(), crange.end(), crange.begin(), bind2nd( plus<char>(), 1 ) );    // uppercase the range    to_upper( crange );    cout << text << endl;    cout << endl;    return 0;}

boost 判定函数的使用

#include <string>#include <iostream>#include <functional>#include <boost/algorithm/string/predicate.hpp>#include <boost/algorithm/string/classification.hpp>#include <boost/bind.hpp>using namespace std;using namespace boost;int main(){    cout << "* Predicate Example *" << endl << endl;    string str1("123xxx321");    string str2("abc");    // Check if str1 starts with '123'    cout << "str1 starts with \"123\": " <<         (starts_with( str1, string("123") )?"true":"false") << endl;         // Check if str1 ends with '123'    cout << "str1 ends with \"123\": " <<         (ends_with( str1, string("123") )?"true":"false") << endl;     // Check if str1 containes 'xxx'    cout << "str1 contains \"xxx\": " <<         (contains( str1, string("xxx") )?"true":"false") << endl;     // Check if str2 equals to 'abc'    cout << "str2 equals \"abc\": " <<         (equals( str2, string("abc") )?"true":"false") << endl;     // Classification functors and all predicate    if ( all(";.,", is_punct() ) )    {        cout << "\";.,\" are all punctuation characters" << endl;      }    // Classification predicates can be combined     if ( all("abcxxx", is_any_of("xabc") && !is_space() ) )    {        cout << "true" << endl;    }    cout << endl;    return 0;}   

boost替换示例

#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;}