Odp: [Javascript] excluding special characters in a form

[grzegorz.stasica at delphiauto.com]

Hi

For me the best solution which I find myself instantly is Regular Expression.

the snippet is as follow:
function CheckCreditCard(form) {
  var re = RegExp(form.regexp.value)
  var input = form.main.value
 if (input.search(re) !=-1) {
      alert ("ok")
  } else {
  alert ("Error")
 }
}

you can customize this function as you wish remember only that
form.regexp.value should be replaced with some regular expression for  credit
card e.g 1111-1111-1111-1111 regular expresion should be :
/\d{4}[\-]\d{4}[\-]\d{4}[\-]\d{4}/
if yoy don't remember below is short explenation
/ - begin or end of regular expression
\d{4} - you expect to have 4 numbers
[\-] - you expect "-"sign

Rgs.