javascript regex : only english letters allowed

Question

Quick question: I need to allow an input to only accept letters, from a to z and from A to Z, but can't find any expression for that. I want to use the javascript test() method.

Answer 1

let res = /^[a-zA-Z]+$/.test('sfjd'); console.log(res);

Note: If you have any punctuation marks or anything, those are all invalid too. Dashes and underscores are invalid. \w covers a-zA-Z and some other word characters. It all depends on what you need specifically.

Answer 2

Another option is to use the case-insensitive flag i, then there's no need for the extra character range A-Z.

var reg = /^[a-z]+$/i; console.log( reg.test("somethingELSE") ); //true console.log( "somethingELSE".match(reg)[0] ); //"somethingELSE" 

Here's a DEMO on how this regex works with test() and match().