freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-upper-and-lower-number-of-matches.md

---
id: 587d7db9367417b2b2512ba5
title: Specify Upper and Lower Number of Matches
challengeType: 1
forumTopicId: 301367
---

## Description
<section id='description'>
Recall that you use the plus sign <code>+</code> to look for one or more characters and the asterisk <code>*</code> to look for zero or more characters. These are convenient but sometimes you want to match a certain range of patterns.
You can specify the lower and upper number of patterns with <dfn>quantity specifiers</dfn>. Quantity specifiers are used with curly brackets (<code>{</code> and <code>}</code>). You put two numbers between the curly brackets - for the lower and upper number of patterns.
For example, to match only the letter <code>a</code> appearing between <code>3</code> and <code>5</code> times in the string <code>"ah"</code>, your regex would be <code>/a{3,5}h/</code>.

```js
let A4 = "aaaah";
let A2 = "aah";
let multipleA = /a{3,5}h/;
multipleA.test(A4); // Returns true
multipleA.test(A2); // Returns false
```

</section>

## Instructions
<section id='instructions'>
Change the regex <code>ohRegex</code> to match the entire phrase <code>"Oh no"</code> only when it has <code>3</code> to <code>6</code> letter <code>h</code>'s.
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: Your regex should use curly brackets.
    testString: assert(ohRegex.source.match(/{.*?}/).length > 0);
  - text: Your regex should not match <code>"Ohh no"</code>
    testString: assert(!ohRegex.test("Ohh no"));
  - text: Your regex should match <code>"Ohhh no"</code>
    testString: assert("Ohhh no".match(ohRegex)[0].length === 7);
  - text: Your regex should match <code>"Ohhhh no"</code>
    testString: assert("Ohhhh no".match(ohRegex)[0].length === 8);
  - text: Your regex should match <code>"Ohhhhh no"</code>
    testString: assert("Ohhhhh no".match(ohRegex)[0].length === 9);
  - text: Your regex should match <code>"Ohhhhhh no"</code>
    testString: assert("Ohhhhhh no".match(ohRegex)[0].length === 10);
  - text: Your regex should not match <code>"Ohhhhhhh no"</code>
    testString: assert(!ohRegex.test("Ohhhhhhh no"));

```

</section>

## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>

```js
let ohStr = "Ohhh no";
let ohRegex = /change/; // Change this line
let result = ohRegex.test(ohStr);
```

</div>
</section>

## Solution
<section id='solution'>

```js
let ohStr = "Ohhh no";
let ohRegex = /Oh{3,6} no/; // Change this line
let result = ohRegex.test(ohStr);
```

</section>