BOOST 字符串查找示例
2012-08-28 11:15
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BOOST 字符串查找示例
boost 判定函数的使用
boost替换示例
#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; }
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