JavaScript RegExp [abc] Expression

The RegExp [abc] Expression in JavaScript is used to search any character between the brackets. The character inside the brackets can be a single character or a span of characters.

• [A-Z]: It is used to match any character from uppercase A to Z.
• [a-z]: It is used to match any character from lowercase a to z.
• [A-z]: It is used to match any character from uppercase A to lowercase z.
• [abc…]: It is used to match any character between the brackets.

const regex = /[abc]/;
const str = "computer";

console.log(regex.test(str));

true

Syntax

/[abc]/ 
// or
new RegExp("[abc]")

Syntax with modifiers

/\[abc]/g 
// or
new RegExp("[abc]", "g")

Example 1: Searches the characters between [A-G] i.e uppercase A to uppercase G in the whole string. 

let str = 'GEEKSFORGEEKS: A computer science portal for geeks.';
let regex = /[A-G]/g;
let match = str.match(regex);

console.log(match);

[
  'G', 'E', 'E',
  'F', 'G', 'E',
  'E', 'A'
]

Example 2: Searches the characters between [a-g] i.e lowercase a to lowercase in the whole string. 

let str = "GEEKSFORGEEKS: computer science portal for geeks.";
let regex = /[a-g]/g;
let match = str.match(regex);

console.log(match);

[
  'c', 'e', 'c', 'e',
  'c', 'e', 'a', 'f',
  'g', 'e', 'e'
]

Supported Browsers

• Chrome
• Safari
• Firefox
• Opera
• Edge

We have a complete list of Javascript RegExp expressions, to check those please go through this JavaScript RegExp Complete Reference article.

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.  

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Vishal Chaudhary 2

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