91 lines
2.4 KiB
Markdown
91 lines
2.4 KiB
Markdown
---
|
|
id: 587d7db4367417b2b2512b90
|
|
title: 同時用多種模式匹配文字字符串
|
|
challengeType: 1
|
|
forumTopicId: 301345
|
|
dashedName: match-a-literal-string-with-different-possibilities
|
|
---
|
|
|
|
# --description--
|
|
|
|
使用正則表達式`/coding/`，你可以在其他字符串中查找`coding`。
|
|
|
|
這對於搜尋單個字符串非常有用，但僅限於一種匹配模式。 你可以使用 `alternation` 或 `OR` 操作符搜索多個模式： `|`
|
|
|
|
此操作符匹配操作符前面或後面的字符。 例如，如果你想匹配 `yes` 或 `no`，你需要的正則表達式是 `/yes|no/`。
|
|
|
|
你還可以匹配多個規則，這可以通過添加更多的匹配模式來實現。 這些匹配模式將包含更多的 `OR` 操作符來分隔它們，比如`/yes|no|maybe/`。
|
|
|
|
# --instructions--
|
|
|
|
完成正則表達式 `petRegex` 以匹配 `dog`、`cat`、`bird` 或者 `fish`。
|
|
|
|
# --hints--
|
|
|
|
對於字符串 `John has a pet dog.`，你的正則表達式`petRegex` 應該返回 `true`
|
|
|
|
```js
|
|
petRegex.lastIndex = 0;
|
|
assert(petRegex.test('John has a pet dog.'));
|
|
```
|
|
|
|
對於字符串 `Emma has a pet rock.`，你的正則表達式 `petRegex` 的應該返回 `false`
|
|
|
|
```js
|
|
petRegex.lastIndex = 0;
|
|
assert(!petRegex.test('Emma has a pet rock.'));
|
|
```
|
|
|
|
對於字符串 `Emma has a pet bird.`，你的正則表達式 `petRegex` 應該返回 `true`
|
|
|
|
```js
|
|
petRegex.lastIndex = 0;
|
|
assert(petRegex.test('Emma has a pet bird.'));
|
|
```
|
|
|
|
對於字符串 `Liz has a pet cat.`，你的正則表達式 `petRegex` 應該返回 `true`
|
|
|
|
```js
|
|
petRegex.lastIndex = 0;
|
|
assert(petRegex.test('Liz has a pet cat.'));
|
|
```
|
|
|
|
對於字符串 `Kara has a pet dolphin.`，你的正則表達式 `petRegex` 應該返回 `false`
|
|
|
|
```js
|
|
petRegex.lastIndex = 0;
|
|
assert(!petRegex.test('Kara has a pet dolphin.'));
|
|
```
|
|
|
|
對於字符串 `Alice has a pet fish.`，你的正則表達式 `petRegex` 應該返回 `true`。
|
|
|
|
```js
|
|
petRegex.lastIndex = 0;
|
|
assert(petRegex.test('Alice has a pet fish.'));
|
|
```
|
|
|
|
對於字符串 `Jimmy has a pet computer.`，你的正則表達式 `petRegex` 應該返回 `false`。
|
|
|
|
```js
|
|
petRegex.lastIndex = 0;
|
|
assert(!petRegex.test('Jimmy has a pet computer.'));
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
let petString = "James has a pet cat.";
|
|
let petRegex = /change/; // Change this line
|
|
let result = petRegex.test(petString);
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
let petString = "James has a pet cat.";
|
|
let petRegex = /dog|cat|bird|fish/; // Change this line
|
|
let result = petRegex.test(petString);
|
|
```
|