字符串替换

最新推荐文章于 2024-03-22 18:43:22 发布

原创最新推荐文章于 2024-03-22 18:43:22 发布 · 252 阅读

0 ·

CC 4.0 BY-SA版权

本文介绍了一种在C++中实现字符串全局替换的方法，并提供了两种不同的实现方式：一种是在找到匹配项时进行替换，另一种是确保每次只替换一个实例。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

filename: replace.cpp

#include <string>
#include <iostream>

std::string& replace_all(std::string& str, const std::string& oldval, const std::string& newval)
{
while(true)
{
std::string::size_type pos(0);
pos = str.find(oldval);
if( pos != std::string::npos )
{
str.replace(pos, oldval.length(), newval);
}
else
{
break;
}

}

return str;
}

std::string& replace_all_distinct( std::string& str, const std::string& oldval, const std::string& newval)
{
for( std::string::size_type pos(0); pos != std::string::npos; pos += newval.length() )
{
if( (pos = str.find(oldval, pos)) != std::string::npos )
{
str.replace(pos, oldval.length(), newval);
}
else
{
break;
}

}
return str;
}

int main()
{
std::string str = "hello11hello11hello11";
std::string oldval = "11";
std::string newval = "888";

str = "hello11hello11hello11";
std::string strfin = replace_all(str, oldval, newval);
std::cout << strfin << std::endl;
std::cout << replace_all_distinct(str, oldval, newval) << std::endl;

std::cout << "final string: " << strfin << std::endl;
oldval = "888";
newval = "";
std::string fs1 = replace_all( strfin, oldval, newval );
std::cout << "result:" << fs1 << std::endl;

}