Check if a string contains only letters and numbers

JavaScript

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

TypeScript

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

Examples

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