本文实例讲述了C++中BOOST字符串查找的方法，分享给大家供大家参考。具体方法如下：

BOOST 字符串查找示例

复制代码 代码如下:#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

复制代码 代码如下:#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

复制代码 代码如下:#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

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;
}

希望本文所述对大家的C++程序设计有所帮助。