javascript regex to return letters only

Question

My string can be something like A01, B02, C03, possibly AA18 in the future as well. I thought I could use a regex to get just the letters and work on my regex since I haven't done much with it. I wrote this function:

function rowOffset(sequence) {               console.log(sequence);             var matches = /^[a-zA-Z]+$/.exec(sequence);             console.log(matches);             var letter = matches[0].toUpperCase();             return letter; }  var x = "A01"; console.log(rowOffset(x)); 

My matches continue to be null. Am I doing this correctly? Looking at this post, I thought the regex was correct: Regular expression for only characters a-z, A-Z

Answer 1

You can use String#replace to remove all non letters from input string:

var r = 'AA18'.replace(/[^a-zA-Z]+/g, ''); //=> "AA"