Last Updated : 11 Jul, 2025
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.
const regex = /[abc]/;
const str = "computer";
console.log(regex.test(str));
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.
JavaScript
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.
JavaScript
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
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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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4