Answers for "js only number and string validation regex"

regex check for numbers only js

var ticket = "11122";
var reg = new RegExp('^[0-9]*$');

if (reg.test(ticket)==false) {
  alert('Only Numeric Ticket ID is allowed.');
  return false;
}

javascript regex number only

let test = "1(919)-723-9378"
console.log(test.replace(/[^\d]/g, "")) // output: 19197239378
/\D/g     //\D is everything not \d
/[^\d]/g  //\d is numerical characters 0-9
/[^0-9]/g //The ^ inside [] means not, so in this case, not numerical characters