---
id: 587d7db4367417b2b2512b90
title: Match a Literal String with Different Possibilities
challengeType: 1
videoUrl: ''
localeTitle: 匹配具有不同可能性的文字字符串
---
## Description
使用/coding/等正则表达式，可以在另一个字符串中查找"coding"模式。这对搜索单个字符串很有用，但它仅限于一种模式。您可以使用alternation或OR运算符搜索多个模式： | 。此运算符在其之前或之后匹配模式。例如，如果你想匹配"yes"或"no" ，你想要的正则表达式是/yes|no/ 。您还可以搜索两种以上的模式。您可以通过添加更多模式来实现此操作，其中更多OR运算符将它们分开，例如/yes|no|maybe/ 。
## Instructions
完成正则表达式petRegex以匹配宠物"dog" ， "cat" ， "bird"或"fish" 。
## Tests
```yml
tests:
- text: 你的正则表达式petRegex应该为字符串"John has a pet dog."返回true "John has a pet dog."
testString: assert(petRegex.test('John has a pet dog.'));
- text: 你的正则表达式petRegex应该为字符串"Emma has a pet rock."返回false "Emma has a pet rock."
testString: assert(!petRegex.test('Emma has a pet rock.'));
- text: 你的正则表达式petRegex应该为字符串"Emma has a pet bird."返回true "Emma has a pet bird."
testString: assert(petRegex.test('Emma has a pet bird.'));
- text: 你的正则表达式petRegex应该返回true为字符串"Liz has a pet cat."
testString: assert(petRegex.test('Liz has a pet cat.'));
- text: 你的正则表达式petRegex应该返回false为"Kara has a pet dolphin."的字符串"Kara has a pet dolphin."
testString: assert(!petRegex.test('Kara has a pet dolphin.'));
- text: 你的正则表达式petRegex应该返回true为字符串"Alice has a pet fish."
testString: assert(petRegex.test('Alice has a pet fish.'));
- text: 你的正则表达式petRegex应该返回false为字符串"Jimmy has a pet computer."
testString: assert(!petRegex.test('Jimmy has a pet computer.'));
```
## Challenge Seed
```js
let petString = "James has a pet cat.";
let petRegex = /change/; // Change this line
let result = petRegex.test(petString);
```
## Solution
```js
// solution required
```