字符串中符号的替换---replace的用法

 #include<iostream>
     #include<string>

     using namespace std;

     int main()
     {
     string s1 = "one*two*three";//Given String
     string s2 = "*";//delimeter
     string s3 = ",";//string to replace

     cout << "s1 = " << s1 << endl;//Original String before replace

     bool flag = true;
     while(flag)
     {
     size_t found = s1.find(s2);//Stores the size of the string by using find() function
     if(found != string::npos)//its check until the 'n' of the occurence in the given string.
     {
     s1.replace(found, s2.length(), s3);//Replace the string using the replace() function
     }
     else
     {
     flag = false;
     }
     }
     cout << "s1 = " << s1 << endl;//After replacing the string

     return ;
     }

运行结果：

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basic_string::replace

将原string 中的元素或子串替换。返回替换后的string。

（1）用string 或C-string 代替操作string 中从 _Pos1 开始的 _Num1 个字符

basic _ string& replace( size _ type _Pos1 ,size _ type _Num1 , const value _ type* _Ptr );

basic _ string& replace(size _ type _Pos1 ,size _ type _Num1 ,const basic _ string _Str );

 string a,b;

 string s ( "AAAAAAAA" );

 string s1p ( "BBB" );

 const char* cs1p = "CCC" ；

 a = s.replace (  ,  , s1p ); // s= ” ABBBAAAA ”

 b = s.replace (  ,  , cs1p ); // s= ” ABBBACCC ” 

（2）用string 中从 _Pos2 开始的 _Num2 个字符,代替操作string 中从 _Pos1 开始的 _Num1 个字符

用C-string 中的 _Num2 个字符，代替操作string 中从 _Pos1 开始的 _Num1 个字符

basic _ string& replace( size _ type _Pos1 , size _ type _Num1 , const basic _ string& _Str ,

size _ type _Pos2 , size _ type _Num2 );

basic _ string& replace( size _ type _Pos1 , size _ type _Num1 ,

const value _ type* _Ptr , size _ type _Num2 );

 string a, b;

 string s ( "AAAAAAAA" );

 string s2p ( "BBB" );

 const char* cs2p = "CCC";

 a = s.replace (  ,  , s2p ,  ,  ); // s= ” ABBAAAA ”

 b = s.replace (  ,  , cs2p ,  ); // s= ” ABBAC ” 

（3）用 _Count 个character _Ch , 代替操作string 中从 _Pos1 开始的 _Num1 个字符

basic _ string& replace( size _ type _Pos1 , size _ type _Num1 ,

size _ type _Count , value _ type _Ch );

 string result;

 string s ( "AAAAAAAA" );

 char ch = 'C';

 result = s.replace (  ,  ,  , ch ); // s= ” ACCCCAAAA ” 

（4）用string 或C-string ,代替操作string 中从 First0 到 Last0 的字符

basic _ string&replace(iterator First0 ,iterator Last0 , const basic _ string& _Str );

basic _ string&replace(iterator First0 ,iterator _Last0 , const value _ type* _Ptr );

string s ( "AAAAAAAA" ); string s4p ( "BBB" );

const char* cs4p = "CCC";

basic_string<char>::iterator IterF0, IterL0;

IterF0 = s.begin ( ); IterL0 = s.begin ( ) + 3;

string a, b;

a = s.replace ( IterF0 , IterL0 , s4p ); // s= ” BBBAAAAA ”

b = s.replace ( IterF0 , IterL0 , cs4p ); // s= ” CCCAAAAA ”

（5）用string 中从 _Pos2 开始的 _Num2 个字符,代替操作string 中从 First0 到 Last0 的字符

用C-string 中的 _Num2 个字符，代替操作string 中从 First0 到 Last0 的字符

basic _ string& replace( iterator _First0 , iterator _Last0 ,

const value _ type* _Ptr , size _ type _Num2 );

template<class InputIterator> basic _ string& replace(

iterator _First0 , iterator _Last0 ,

InputIterator _First , InputIterator _Last );

IterF3 = s.begin ( ) + 1; IterL3 = s.begin ( ) + 3;

IterF4 = s.begin ( ); IterL4 = s.begin ( ) + 2;

a = s.replace ( IterF3 , IterL3 , IterF4 , IterL4 );

b = s.replace ( IterF1 , IterL1 , cs5p , 4 );

（6）用 _Count 个character _Ch , 代替操作string 中从 First0 到 Last0 的字符

basic _ string& replace( iterator _First0 , iterator _Last0 ,

size _ type _Count , value _ type _Ch );

a = s.replace ( IterF2 , IterL2 , 4 , ch );