How to check if a string contains only letters and numbers in JavaScript

In this Article we will go through how to check if a string contains only letters and numbers only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isAlphanumeric = str => /^[0-9A-Z]+$/i.test(str);

isAlphanumeric('helloworld');           // true
isAlphanumeric('HelloWorld');           // true
isAlphanumeric('hello world');          // false
isAlphanumeric('hello123');             // true
isAlphanumeric('hello 123');            // false