如何检查字符串是否包含 Rust 中的子字符串? [英] How to check if a string contains a substring in Rust?

问题描述

我正在尝试查找子字符串是否在字符串中.在 Python 中，这涉及到 in 操作符，所以我写了这段代码:

I'm trying to find whether a substring is in a string. In Python, this involves the in operator, so I wrote this code:

let a = "abcd";
if "bc" in a {
    do_something();
}

我收到一条奇怪的错误消息:

I get a strange error message:

error: expected `{`, found `in`
 --> src/main.rs:3:13
  |
3 |       if "bc" in a {
  |  _____________-^
4 | |         do_something();
5 | |     }
  | |_____- help: try placing this code inside a block: `{ a <- { do_something(); }; }`

该消息表明我将其放入一个块中，但我不知道该怎么做.

The message suggests that I put it in a block, but I have no idea how to do that.

推荐答案

Rust 没有这样的操作符.您可以使用 String::contains方法代替:

Rust has no such operator. You can use the String::contains method instead:

if a.contains("bc") {
    do_something();
}

这篇关于如何检查字符串是否包含 Rust 中的子字符串?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！