C ++中的字符串流来解析单词字符串&数字 [英] String Stream in C++ to parse string of words & numbers

问题描述

我有这样的字符串:'123plus43times7'

I have string like this: '123plus43times7'

数字后面是字典中的单词.

where numbers are followed by words from a dictionary.

我知道我可以使用 >> 操作符提取整数/数字:

I understand that I can extract int/numbers by using the >> operator:

StringStream >> number

我可以得到号码.但是，Stream 中仍然包含编号.当数字的长度未知时如何删除数字，或者我应该找出数字的长度然后使用 str.substr() 创建一个新的 String Stream ?任何其他使用 C++ STL String 和 SStream 执行此操作的更好方法将不胜感激.

I can get the number. However, the Stream still has the number in it. How do I remove the number when the length of number is unknown or should I find out length of number and then use str.substr() to create a new String Stream ? Any other better method for doing it using C++ STL String and SStream would be really appreciated.

推荐答案

可以在文本和数字之间插入空格，然后使用std::stringstream

You can insert blank space between text and numbers and then use std::stringstream

#include <iostream>
#include <string>
#include <sstream>
#include <cctype>

int main() 
{
    std::string s = "123plus43times7";
    for (size_t i = 0; i < (s.size() -1 ); i++)
    {
        if (std::isalpha(s[i]) != std::isalpha(s[i + 1]))
        {
            i++;
            s.insert(i, " ");
        }
    }
    std::stringstream ss(s);
    while (ss >> s)
        std::cout << s << "\n";
    return 0;
}

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