30-seconds-of-code/javascript/snippets/is-alpha-numeric.md

title, type, tags, cover, dateModified

title	type	tags	cover	dateModified
String is alphanumeric	snippet	string regexp	mountain-lake-cottage-2	2020-10-20T23:02:01+03:00

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