用另一个字符串替换一个字符串的一部分
在 C++ 中是否可以用另一个字符串替换部分字符串?
Is it possible in C++ to replace part of a string with another string?
基本上,我想这样做:
QString string("hello $name");
string.replace("$name", "Somename");
但我想使用标准 C++ 库.
But I would like to use the Standard C++ libraries.
推荐答案
有一个函数可以在字符串中查找子字符串 (find
),以及用另一个字符串替换字符串中特定范围的函数 (replace
),因此您可以将它们组合起来以获得您想要的效果:
There's a function to find a substring within a string (find
), and a function to replace a particular range in a string with another string (replace
), so you can combine those to get the effect you want:
bool replace(std::string& str, const std::string& from, const std::string& to) {
size_t start_pos = str.find(from);
if(start_pos == std::string::npos)
return false;
str.replace(start_pos, from.length(), to);
return true;
}
std::string string("hello $name");
replace(string, "$name", "Somename");
<小时>
在回复评论时,我认为 replaceAll
可能看起来像这样:
void replaceAll(std::string& str, const std::string& from, const std::string& to) {
if(from.empty())
return;
size_t start_pos = 0;
while((start_pos = str.find(from, start_pos)) != std::string::npos) {
str.replace(start_pos, from.length(), to);
start_pos += to.length(); // In case 'to' contains 'from', like replacing 'x' with 'yx'
}
}
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