JSFiddle - React, Tailwind, and code Playground

JavaScript

function isAlphaNumeric(value, allow)
{
    var result = new RegExp("^[A-Za-z0-9" + allow + "]+$").test(value);
    return result;
}

var values = ['123f', "12-44_ab-c", "mg/a1", ''];
$.each(values, function(i, value) {
    var res = isAlphaNumeric(value , "_-");
    $('body').append("'" + value + "' isAlphaNumeric: " + res + '<br>');
});