isAlphaNumeric

Checks if a string contains only alphanumeric characters.

• Use RegExp.prototype.test() to check if the input string matches against the alphanumeric regexp pattern.

const isAlphaNumeric = str => /^[a-z0-9]+$/gi.test(str);

isAlphaNumeric('hello123'); // true
isAlphaNumeric('123'); // true
isAlphaNumeric('hello 123'); // false (space character is not alphanumeric)
isAlphaNumeric('#$hello'); // false