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isAlphaNumeric javascript Code Snippet in 2023

stringregexpbeginner

Last Updated: 28 January 2023

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

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