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XCSDD/docs/api/containers/string/find.md
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String::Find

SizeType Find(const char* str, SizeType pos = 0) const;

在字符串中查找子串 str,从位置 pos 开始搜索。

参数:

  • str - 要查找的以 null 结尾的 C 字符串
  • pos - 开始搜索的位置,默认为 0

返回: 子串首次出现的起始位置;如果未找到,返回 String::npos

复杂度: O(n * m),其中 n 为原字符串长度m 为要查找的字符串长度

示例:

#include "XCEngine/Containers/String.h"
#include <iostream>

int main() {
    XCEngine::Containers::String s("Hello World, Hello Universe");

    XCEngine::Containers::String::SizeType pos1 = s.Find("World");
    std::cout << "Found at: " << pos1 << std::endl;  // 输出: Found at: 6

    XCEngine::Containers::String::SizeType pos2 = s.Find("Hello", 0);
    std::cout << "First 'Hello' at: " << pos2 << std::endl;  // 输出: First 'Hello' at: 0

    XCEngine::Containers::String::SizeType pos3 = s.Find("Hello", 7);
    std::cout << "Second 'Hello' at: " << pos3 << std::endl;  // 输出: Second 'Hello' at: 13

    XCEngine::Containers::String::SizeType pos4 = s.Find("NotFound");
    if (pos4 == XCEngine::Containers::String::npos) {
        std::cout << "Not found" << std::endl;  // 输出: Not found
    }

    return 0;
}

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