68 lines
1.8 KiB
Markdown
68 lines
1.8 KiB
Markdown
---
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id: 587d7db3367417b2b2512b8e
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title: Using the Test Method
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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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Regular expressions are used in programming languages to match parts of strings. You create patterns to help you do that matching.
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If you want to find the word <code>"the"</code> in the string <code>"The dog chased the cat"</code>, you could use the following regular expression: <code>/the/</code>. Notice that quote marks are not required within the regular expression.
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JavaScript has multiple ways to use regexes. One way to test a regex is using the <code>.test()</code> method. The <code>.test()</code> method takes the regex, applies it to a string (which is placed inside the parentheses), and returns <code>true</code> or <code>false</code> if your pattern finds something or not.
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```js
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let testStr = "freeCodeCamp";
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let testRegex = /Code/;
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testRegex.test(testStr);
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// Returns true
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```
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</section>
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## Instructions
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<section id='instructions'>
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Apply the regex <code>myRegex</code> on the string <code>myString</code> using the <code>.test()</code> method.
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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: You should use <code>.test()</code> to test the regex.
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testString: assert(code.match(/myRegex.test\(\s*myString\s*\)/), 'You should use <code>.test()</code> to test the regex.');
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- text: Your result should return <code>true</code>.
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testString: assert(result === true, 'Your result should return <code>true</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 myString = "Hello, World!";
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let myRegex = /Hello/;
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let result = myRegex; // Change this line
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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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let myString = "Hello, World!";
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let myRegex = /Hello/;
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let result = myRegex.test(myString); // Change this line
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```
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</section>
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