62 lines
3.6 KiB
Markdown
62 lines
3.6 KiB
Markdown
---
|
||
id: 587d7db7367417b2b2512b9f
|
||
title: Match All Letters and Numbers
|
||
challengeType: 1
|
||
videoUrl: ''
|
||
localeTitle: 匹配所有字母和数字
|
||
---
|
||
|
||
## Description
|
||
<section id="description">使用字符类,您可以使用<code>[az]</code>搜索字母表中的所有字母。这种字符类很常见,它有一个快捷方式,虽然它还包含一些额外的字符。 JavaScript中与字母表匹配的最接近的字符类是<code>\w</code> 。此快捷方式等于<code>[A-Za-z0-9_]</code> 。此字符类匹配大写和小写字母加数字。注意,此字符类还包括下划线字符( <code>_</code> )。 <blockquote>让longHand = / [A-Za-z0-9 _] + /; <br>让shortHand = / \ w + /; <br>让数字=“42”; <br> let varNames =“important_var”; <br> longHand.test(数字); //返回true <br> shortHand.test(数字); //返回true <br> longHand.test(varNames); //返回true <br> shortHand.test(varNames); //返回true </blockquote>这些快捷方式字符类也称为<code>shorthand character classes</code> 。 </section>
|
||
|
||
## Instructions
|
||
<section id="instructions">使用速记字符类<code>\w</code>来计算各种引号和字符串中的字母数字字符数。 </section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: 你的正则表达式应该使用全局标志。
|
||
testString: 'assert(alphabetRegexV2.global, "Your regex should use the global flag.");'
|
||
- text: 你的正则表达式应该使用速记字符
|
||
testString: 'assert(/\\w/.test(alphabetRegexV2.source), "Your regex should use the shorthand character <code>\w</code> to match all characters which are alphanumeric.");'
|
||
- text: 你的正则表达式应该在<code>"The five boxing wizards jump quickly."</code>找到31个字母数字字符<code>"The five boxing wizards jump quickly."</code>
|
||
testString: 'assert("The five boxing wizards jump quickly.".match(alphabetRegexV2).length === 31, "Your regex should find 31 alphanumeric characters in <code>"The five boxing wizards jump quickly."</code>");'
|
||
- text: 你的正则表达式应该在<code>"Pack my box with five dozen liquor jugs."</code>找到32个字母数字字符<code>"Pack my box with five dozen liquor jugs."</code>
|
||
testString: 'assert("Pack my box with five dozen liquor jugs.".match(alphabetRegexV2).length === 32, "Your regex should find 32 alphanumeric characters in <code>"Pack my box with five dozen liquor jugs."</code>");'
|
||
- text: 你的正则表达式应该在<code>"How vexingly quick daft zebras jump!"</code>找到30个字母数字字符<code>"How vexingly quick daft zebras jump!"</code>
|
||
testString: 'assert("How vexingly quick daft zebras jump!".match(alphabetRegexV2).length === 30, "Your regex should find 30 alphanumeric characters in <code>"How vexingly quick daft zebras jump!"</code>");'
|
||
- text: 你的正则表达式应该在<code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>找到36个字母数字字符<code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>
|
||
testString: 'assert("123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ.".match(alphabetRegexV2).length === 36, "Your regex should find 36 alphanumeric characters in <code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>");'
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='js-seed'>
|
||
|
||
```js
|
||
let quoteSample = "The five boxing wizards jump quickly.";
|
||
let alphabetRegexV2 = /change/; // Change this line
|
||
let result = quoteSample.match(alphabetRegexV2).length;
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
</section>
|