RegEx: Examples
// 6 fixed numeric characters
var regEx = /^\d{6}$/;
if (!regEx.test(testingString)) {
// Do something
}
// 17 to 18 numeric characters staring with "89"
var regEx = /^89\d{17,18}$/;
if (!regEx.test(testingString)) {
// Do something
}
// 1 to 10 numeric characters
var regEx = /^[0-9]{1,10}$/
if (!regEx.test(testingString)) {
// Do something
}