C ++字符替换 [英] C++ character replace

问题描述

更换字符串中的字符的最好方法是什么？

What is the best way to replace characters in a string?

具体来说：

"This,Is A|Test" ----> "This_Is_A_Test"

我要替换所有的逗号，空格和|

I want to replace all commas, spaces, and "|" with underscores.

（我可以访问Boost。）

(I have access to Boost.)

推荐答案

如其他答案所示，您可以使用各种 replace 方法。然而，这些方法具有扫描字符串多次（每个字符一次）的缺点。如果你关心速度，我建议你滚动自己的替换方法：

As the other answers indicated, you can use the various replace methods. However, these approaches have the downside of scanning the string multiple times (one time for each character). I would recommend rolling your own replace method, if you care about speed:

void beautify(std::string &s) {
    int i;
    for (i = 0; i < s.length(); ++i) {
        switch (s[i]) {
        case ' ':
        case ',':
        case '|':
            s[i] = '_';
        }
    }
}

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