function VerifyFormData() { if (document.subscribe.realname.value == "") { alert("Please enter your name.") document.subscribe.realname.focus() return false; } if (!emailCheck(document.subscribe.email.value)) { document.subscribe.email.focus() return false; } } function emailCheck (emailStr) { var emailPat=/^(.+)@(.+)$/ var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]" var validChars="\[^\\s" + specialChars + "\]" var quotedUser="(\"[^\"]*\")" var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/ var atom=validChars + '+' var word="(" + atom + "|" + quotedUser + ")" var userPat=new RegExp("^" + word + "(\\." + word + ")*$") var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$") var matchArray=emailStr.match(emailPat) if (matchArray==null) { alert("Email address seems incorrect (check @ and .'s)") return false } var user=matchArray[1] var domain=matchArray[2] // See if "user" is valid if (user.match(userPat)==null) { // user is not valid alert("The username doesn't seem to be valid.") return false } var IPArray=domain.match(ipDomainPat) if (IPArray!=null) { // this is an IP address for (var i=1;i<=4;i++) { if (IPArray[i]>255) { alert("Destination IP address is invalid!") return false } } return true } // Domain is symbolic name var domainArray=domain.match(domainPat) if (domainArray==null) { alert("The domain name doesn't seem to be valid.") return false } var atomPat=new RegExp(atom,"g") var domArr=domain.match(atomPat) var len=domArr.length if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>3) { // the address must end in a two letter or three letter word. alert("The address must end in a three-letter domain, or two letter country.") return false } // Make sure there's a host name preceding the domain. if (len<2) { var errStr="This address is missing a hostname!" alert(errStr) return false } return true; } // End -->