javascript regular expression

var reg_exp = /pattern/gmi;

var reg_exp = /pattern/gmi;

var no_letters = 'abc123XYZ'.replace(/[a-z]/gmi, '');
console.log(no_letters); // return '123'

var no_letters = 'abc123XYZ'.replace(/[a-z]/gmi, ''); console.log(no_letters); // return '123'