string的查找和替换

1、替换字符串s1中的s2.

//把字符串中的“、”替换为123. 
#include <iostream>
using namespace std;
#include "string"
#include "algorithm"

void main()
{
    string s1 = "STL可分为容器(containers)、迭代器(iterators)、空间配置器(allocator)、配接器(adapters)、算法(algorithms)、仿函数(functors)六个部分";
    string s2 = "、";
    int len = s2.length(); 
    cout << len << endl;
    cout << s1<< endl;
    int off = 0;
    off = s1.find(s2, 0);
    while (off != string:: npos)
    {
    //  s1.erase(off, len);
        s1.replace(off, len ,"123");
        off = s1.find(s2, off + 1);
    }
    cout << "s1替换后的结果: " << s1 << endl;

    system("pause");
}

2、去除字符串中的括号

#include <iostream>
using namespace std;
#include "string"
#include "algorithm"

void main()
{
    string s1 = "STL可分为容器(containers)、迭代器(iterators)、空间配置器(allocator)、配接器(adapters)、算法(algorithms)、仿函数(functors)六个部分";
    string s2 = "(";
    string s3 = ")";
    int len = s2.length(); 
    cout << len << endl;
    cout << s1<< endl;
    int off = 0;
    off = s1.find(s2, 0);
    while (off != string:: npos)
    {
        s1.erase(off, len);
        //s1.replace(off, len ,"123");
        off = s1.find(s2, off + 1);
    }
    off = s1.find(s3, 0);
    while (off != string::npos)
    {
        s1.erase(off, len);
        //s1.replace(off, len ,"123");
        off = s1.find(s3, off + 1);
    }
    cout << "\ns1替换后的结果: " << s1 << endl;

    system("pause");
}

3.小写字母替换为大写

#include <iostream>
using namespace std;
#include "string"
#include "algorithm"

void main()
{
    string s1 = "STL可分为容器(containers)、迭代器(iterators)、空间配置器(allocator)、配接器(adapters)、算法(algorithms)、仿函数(functors)六个部分";
    //string s2 = "(";
//  string s3 = ")";
//  int len = s2.length(); 
//  cout << len << endl;
    cout << "s1: " << s1 << endl;
    transform(s1.begin(), s1.end(), s1.begin(), toupper);


    cout << "\ns1替换后的结果: " << s1 << endl;

    system("pause");
}