48 lines
1.4 KiB
Markdown
48 lines
1.4 KiB
Markdown
# String::Find
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```cpp
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SizeType Find(const char* str, SizeType pos = 0) const;
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```
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在字符串中查找子串 `str`，从位置 `pos` 开始搜索。
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**参数：**
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- `str` - 要查找的以 null 结尾的 C 字符串
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- `pos` - 开始搜索的位置，默认为 0
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**返回：** 子串首次出现的起始位置；如果未找到，返回 `String::npos`
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**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
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**示例：**
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```cpp
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#include "XCEngine/Core/Containers/String.h"
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#include <iostream>
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int main() {
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XCEngine::Containers::String s("Hello World, Hello Universe");
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XCEngine::Containers::String::SizeType pos1 = s.Find("World");
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std::cout << "Found at: " << pos1 << std::endl; // 输出: Found at: 6
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XCEngine::Containers::String::SizeType pos2 = s.Find("Hello", 0);
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std::cout << "First 'Hello' at: " << pos2 << std::endl; // 输出: First 'Hello' at: 0
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XCEngine::Containers::String::SizeType pos3 = s.Find("Hello", 7);
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std::cout << "Second 'Hello' at: " << pos3 << std::endl; // 输出: Second 'Hello' at: 13
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XCEngine::Containers::String::SizeType pos4 = s.Find("NotFound");
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if (pos4 == XCEngine::Containers::String::npos) {
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std::cout << "Not found" << std::endl; // 输出: Not found
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}
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return 0;
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}
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```
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## 相关文档
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- [String 总览](string.md) - 返回类总览
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- [StartsWith](starts-with.md) - 检查前缀
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- [EndsWith](ends-with.md) - 检查后缀
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