Remove the Vowels from a String in JavaScript

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Borislav Hadzhiev

Mon Nov 08 20212 min read

Remove the Vowels from a String #

To remove the vowels from a string, call the replace() method with the following regular expression - /[aeiou]/gi, e.g. str.replace(/[aeiou]/gi, ''). The replace() method will return a new string where any vowel in the original string is replaced with an empty string.

index.js
const str = 'hello world'; const noVowels = str.replace(/[aeiou]/gi, ''); console.log(noVowels); // 👉️ hll wrld

We passed the following 2 parameters to the String.replace method:

  1. a regular expression to match in the string
  2. the replacement for each match

The forwards slashes / / mark the beginning and end of the regular expression.

The part in the square brackets [] is called a character class and it matches any of the characters in the brackets, in our case - any vowel.

For example, [abc] matches the characters a, b and c.

We used the g (global) flag because we want to match all occurrences of a vowel in the string and not just the first one.

The i flag is used to make the search case insensitive. These two regular expressions are the same:

  • /[aeiou]/gi
  • /[aeiouAEIOU]/g

If you need a regex cheatsheet, check out this one from MDN. It's by far the best one out there.

The second parameter we passed to the replace() method is the replacement string for each match. Because we want to remove each vowel, we replace it with an empty string.

Note that the replace() method does not change the original string, it returns a new string. Strings are immutable in JavaScript.

Further Reading #

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