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JavaScript - remove prefix from string

3 points
Created by:
Adnaan-Robin
424

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

Quick solution:

// ONLINE-RUNNER:browser;

let text = 'ABCD';

let result1 = text.replace(/^(AB)/,'');  // replaces "AB" only if it is at the beginning
let result2 = text.slice(2);             // removes the first two characters
let result3 = text.substring(2);         // removes the first two characters

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

 

Practical examples

1. String.prototype.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;

let text = 'ABCD';

// replace the AB only at the beginning of the string
let result = text.replace(/^(AB)/,'');

console.log(result);  // CD

2. String.prototype.slice()

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

// ONLINE-RUNNER:browser;

let text = 'ABCD';

// remove the first two characters
let result = text.slice(2);

console.log(result);  // CD

3. String.prototype.substring()

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

// ONLINE-RUNNER:browser;

let text = 'ABCD';

// remove the first two characters
let result = text.substring(2);

console.log(result);  // CD

References

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

JavaScript - remove prefix from string
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