A nice email Javascript I have used in the past
goes as follows
function emailCheck (emailStr) {
var emailPat=/^(.+)@(.+)$/
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
var validChars="\[^\\s" + specialChars + "\]"
var firstChars=validChars
var quotedUser="(\"[^\"]*\")"
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
var atom="(" + firstChars + validChars + "*" + ")"
var word="(" + atom + "|" + quotedUser + ")"
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
var matchArray=emailStr.match(emailPat)
if (matchArray==null)
{alert("E-mail 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 section of the e-mail address doesn't seem to be
valid.")
return false
}
/* if the e-mail address is at an IP address (as opposed to a symbolic
host name) make sure the IP address is valid. */
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
}
if (domArr[domArr.length-1].length==2 && len<3) {
var errStr="This address ends in two characters, which is a country"
errStr+=" code. Country codes must be preceded by "
errStr+="a hostname and category (like com, co, pub, pu, etc.)"
alert(errStr)
return false
}
if (domArr[domArr.length-1].length==3 && len<2) {
var errStr="This address is missing a hostname!"
alert(errStr)
return false
}
return true;
}
Hope this helps
Casey Kochmer
[EMAIL PROTECTED]
www.jspinsider.com
>From: "Jan D. Herzhoff" <[EMAIL PROTECTED]>
>Reply-To: A mailing list about Java Server Pages specification and
> reference <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: check emailadress
>Date: Wed, 20 Sep 2000 10:56:23 +0200
>
>Hi,.
>
>I am a newbie in JSP and I would like to create a form with an error
>script.
>If someone types an email adress without an "@" for example an error code
>should appear.
>
>How can I do this or what else do I have to check?
>
>Thanks and best regards,
>
>J/~\n
>
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