C++字符串查找和替换

代码

#include <iostream>
#include <string>
using namespace std;
 
void string_replace(string &str, const string old0, const string new0);
int main(int argc, char* argv[])
{
	string str = "--++---Hello World---++--";
	string strKey = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghikjlmnopqrstuvwxyz";
	string::size_type nPos0 = str.find_first_of(strKey);
	if(nPos0 == string::npos) return -1;
 
	string::size_type nPos1 = str.find_last_of(strKey);
	if(nPos1 == string::npos) return -1;
	
	string newstr = str.substr(nPos0, nPos1 - nPos0 + 1);
	cout <<"ner string: " <<newstr << endl;
	
    string str2 = "abc12123xyz-abc12123xyz";
    string_replace(str2, "12", "98");
	cout << str2 << endl;
    return 0;
}
 
void string_replace(string &str, const string old0, const string new0)
{ 
    string::size_type nPos = 0;
    string::size_type nsrclen = old0.size();
    string::size_type ndstlen = new0.size();
    while(nPos = str.find(old0, nPos))
    {
       if(nPos == string::npos) break;
       str.replace(nPos, nsrclen, new0);
       nPos += ndstlen;
    }
}