JavaScript - remove prefix from string

In this article, we would like to show you how to remove prefix from string in JavaScript.

Quick solution:

// ONLINE-RUNNER:browser;

const text = 'ABCD';

const result1 = text.slice(2);            // omits the first two characters
const result2 = text.substring(2);        // omits the first two characters
const result3 = text.replace(/^AB/, '');  // replaces "AB" only if text starts with it

console.log(result1);  // CD
console.log(result2);  // CD
console.log(result3);  // CD

Practical examples

1. String slice()

In this example, we use String slice() method to omit the first two letters from the text.

// ONLINE-RUNNER:browser;

const text = 'ABCD';
const result = text.slice(2);

console.log(result);  // CD

2. String substring()

In this example, we use String substring() method to omit the first two letters from the text.

// ONLINE-RUNNER:browser;

const text = 'ABCD';
const result = text.substring(2);

console.log(result);  // CD

3. String replace() with regular expression

In this example, we use String replace() method with a regular expression to replace the first two letters (AB) with an empty string.

// ONLINE-RUNNER:browser;

const text = 'ABCD';
const result = text.replace(/^AB/, '');

console.log(result);  // CD

References

1. String.prototype.slice() - JavaScript | MDN
2. String.prototype.substring() - JavaScript | MDN
3. String.prototype.replace() - JavaScript | MDN