d3708422dd
* fix: add test to check if variable is edited * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/remove-whitespace-from-start-and-end.md Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
62 lines
1.4 KiB
Markdown
62 lines
1.4 KiB
Markdown
---
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id: 587d7dbb367417b2b2512bac
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title: Remove Whitespace from Start and End
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challengeType: 1
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forumTopicId: 301362
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dashedName: remove-whitespace-from-start-and-end
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---
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# --description--
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Sometimes whitespace characters around strings are not wanted but are there. Typical processing of strings is to remove the whitespace at the start and end of it.
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# --instructions--
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Write a regex and use the appropriate string methods to remove whitespace at the beginning and end of strings.
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**Note:** The `String.prototype.trim()` method would work here, but you'll need to complete this challenge using regular expressions.
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# --hints--
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`result` should be equal to the string `Hello, World!`
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```js
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assert(result === 'Hello, World!');
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```
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Your solution should not use the `String.prototype.trim()` method.
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```js
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assert(!code.match(/\.?[\s\S]*?trim/));
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```
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The `result` variable should not directly be set to a string
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```js
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assert(!code.match(/result\s*=\s*["'`].*?["'`]/));
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```
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The value of the `hello` variable should not be changed.
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```js
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assert(hello === ' Hello, World! ');
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```
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# --seed--
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## --seed-contents--
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```js
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let hello = " Hello, World! ";
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let wsRegex = /change/; // Change this line
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let result = hello; // Change this line
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```
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# --solutions--
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```js
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let hello = " Hello, World! ";
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let wsRegex = /^(\s+)(.+[^\s])(\s+)$/;
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let result = hello.replace(wsRegex, '$2');
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```
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