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
dashedName: specify-upper-and-lower-number-of-matches
---

# --description--

Recall that you use the plus sign `+` to look for one or more characters and the asterisk `*` 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 (`{` and `}`). You put two numbers between the curly brackets - for the lower and upper number of patterns.

For example, to match only the letter `a` appearing between `3` and `5` times in the string `ah`, your regex would be `/a{3,5}h/`.

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

The first `test` call would return `true`, while the second would return `false`.

# --instructions--

Change the regex `ohRegex` to match the entire phrase `Oh no` only when it has `3` to `6` letter `h`'s.

# --hints--

Your regex should use curly brackets.

```js
assert(ohRegex.source.match(/{.*?}/).length > 0);
```

Your regex should not match the string `Ohh no`

```js
ohRegex.lastIndex = 0;
assert(!ohRegex.test('Ohh no'));
```

Your regex should match the string `Ohhh no`

```js
assert('Ohhh no'.match(ohRegex)[0].length === 7);
```

Your regex should match the string `Ohhhh no`

```js
assert('Ohhhh no'.match(ohRegex)[0].length === 8);
```

Your regex should match the string `Ohhhhh no`

```js
assert('Ohhhhh no'.match(ohRegex)[0].length === 9);
```

Your regex should match the string `Ohhhhhh no`

```js
assert('Ohhhhhh no'.match(ohRegex)[0].length === 10);
```

Your regex should not match the string `Ohhhhhhh no`

```js
ohRegex.lastIndex = 0;
assert(!ohRegex.test('Ohhhhhhh no'));
```

# --seed--

## --seed-contents--

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

# --solutions--

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