30-seconds-of-code/snippets/isAlphaNumeric.md

title, tags

title	tags
isAlphaNumeric	string,regexp,intermediate

Checks if a string contains only alphanumeric characters.

Use String.prototype.match() to check if input string matches against alphanumeric regex pattern.

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

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