79d9012432
* fix(curriculum): tests quotes * fix(curriculum): fill seed-teardown * fix(curriculum): fix tests and remove unneeded seed-teardown
66 lines
3.3 KiB
Markdown
66 lines
3.3 KiB
Markdown
---
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id: 587d7db7367417b2b2512b9f
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title: Match All Letters and Numbers
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challengeType: 1
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---
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## Description
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<section id='description'>
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Using character classes, you were able to search for all letters of the alphabet with <code>[a-z]</code>. This kind of character class is common enough that there is a shortcut for it, although it includes a few extra characters as well.
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The closest character class in JavaScript to match the alphabet is <code>\w</code>. This shortcut is equal to <code>[A-Za-z0-9_]</code>. This character class matches upper and lowercase letters plus numbers. Note, this character class also includes the underscore character (<code>_</code>).
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<blockquote>let longHand = /[A-Za-z0-9_]+/;<br>let shortHand = /\w+/;<br>let numbers = "42";<br>let varNames = "important_var";<br>longHand.test(numbers); // Returns true<br>shortHand.test(numbers); // Returns true<br>longHand.test(varNames); // Returns true<br>shortHand.test(varNames); // Returns true</blockquote>
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These shortcut character classes are also known as <code>shorthand character classes</code>.
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</section>
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## Instructions
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<section id='instructions'>
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Use the shorthand character class <code>\w</code> to count the number of alphanumeric characters in various quotes and strings.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: Your regex should use the global flag.
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testString: assert(alphabetRegexV2.global, 'Your regex should use the global flag.');
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- text: Your regex should use the shorthand character
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testString: assert(/\\w/.test(alphabetRegexV2.source), 'Your regex should use the shorthand character <code>\w</code> to match all characters which are alphanumeric.');
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- text: Your regex should find 31 alphanumeric characters in <code>"The five boxing wizards jump quickly."</code>
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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>');
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- text: Your regex should find 32 alphanumeric characters in <code>"Pack my box with five dozen liquor jugs."</code>
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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>');
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- text: Your regex should find 30 alphanumeric characters in <code>"How vexingly quick daft zebras jump!"</code>
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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>');
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- text: Your regex should find 36 alphanumeric characters in <code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>
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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>');
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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let quoteSample = "The five boxing wizards jump quickly.";
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let alphabetRegexV2 = /change/; // Change this line
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let result = quoteSample.match(alphabetRegexV2).length;
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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