21118bc26a
* fix/regex-lower-number-of-matches * fix/update-guide * fix/convert-blockquote-to-backticks
80 lines
2.3 KiB
Markdown
80 lines
2.3 KiB
Markdown
---
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id: 587d7db9367417b2b2512ba6
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title: Specify Only the Lower Number of Matches
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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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You can specify the lower and upper number of patterns with <code>quantity specifiers</code> using curly brackets. Sometimes you only want to specify the lower number of patterns with no upper limit.
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To only specify the lower number of patterns, keep the first number followed by a comma.
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For example, to match only the string <code>"hah"</code> with the letter <code>a</code> appearing at least <code>3</code> times, your regex would be <code>/ha{3,}h/</code>.
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```js
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let A4 = "haaaah";
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let A2 = "haah";
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let A100 = "h" + "a".repeat(100) + "h";
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let multipleA = /ha{3,}h/;
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multipleA.test(A4); // Returns true
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multipleA.test(A2); // Returns false
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multipleA.test(A100); // 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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Change the regex <code>haRegex</code> to match the word <code>"Hazzah"</code> only when it has four or more letter <code>z</code>'s.
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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 curly brackets.
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testString: assert(haRegex.source.match(/{.*?}/).length > 0);
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- text: Your regex should not match <code>"Hazzah"</code>
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testString: assert(!haRegex.test("Hazzah"));
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- text: Your regex should not match <code>"Hazzzah"</code>
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testString: assert(!haRegex.test("Hazzzah"));
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- text: Your regex should match <code>"Hazzzzah"</code>
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testString: assert("Hazzzzah".match(haRegex)[0].length === 8);
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- text: Your regex should match <code>"Hazzzzzah"</code>
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testString: assert("Hazzzzzah".match(haRegex)[0].length === 9);
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- text: Your regex should match <code>"Hazzzzzzah"</code>
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testString: assert("Hazzzzzzah".match(haRegex)[0].length === 10);
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- text: Your regex should match <code>"Hazzah"</code> with 30 <code>z</code>'s in it.
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testString: assert("Hazzzzzzzzzzzzzzzzzzzzzzzzzzzzzzah".match(haRegex)[0].length === 34);
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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 haStr = "Hazzzzah";
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let haRegex = /change/; // Change this line
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let result = haRegex.test(haStr);
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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 haStr = "Hazzzzah";
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let haRegex = /Haz{4,}ah/; // Change this line
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let result = haRegex.test(haStr);
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```
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</section>
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