61 lines
2.0 KiB
Markdown
61 lines
2.0 KiB
Markdown
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---
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id: 587d7dba367417b2b2512ba8
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title: Check for All or None
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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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Sometimes the patterns you want to search for may have parts of it that may or may not exist. However, it may be important to check for them nonetheless.
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You can specify the possible existence of an element with a question mark, <code>?</code>. This checks for zero or one of the preceding element. You can think of this symbol as saying the previous element is optional.
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For example, there are slight differences in American and British English and you can use the question mark to match both spellings.
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<blockquote>let american = "color";<br>let british = "colour";<br>let rainbowRegex= /colou?r/;<br>rainbowRegex.test(american); // Returns true<br>rainbowRegex.test(british); // Returns true</blockquote>
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</section>
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## Instructions
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<section id='instructions'>
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Change the regex <code>favRegex</code> to match both the American English (favorite) and the British English (favourite) version of the word.
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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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- text: 'Your regex should use the optional symbol, <code>?</code>.'
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testString: 'assert(favRegex.source.match(/\?/).length > 0, "Your regex should use the optional symbol, <code>?</code>.");'
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- text: Your regex should match <code>"favorite"</code>
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testString: 'assert(favRegex.test("favorite"), "Your regex should match <code>"favorite"</code>");'
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- text: Your regex should match <code>"favourite"</code>
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testString: 'assert(favRegex.test("favourite"), "Your regex should match <code>"favourite"</code>");'
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- text: Your regex should not match <code>"fav"</code>
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testString: 'assert(!favRegex.test("fav"), "Your regex should not match <code>"fav"</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 favWord = "favorite";
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let favRegex = /change/; // Change this line
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let result = favRegex.test(favWord);
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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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