Valider email med ASP

Du kan benytte følgende JavaScript funktion:

PS.: Ved godt det ikke er ASP.

<!-- Begin
function fnEmailValidate(emailStr) {
/* The following pattern is used to check if the entered e-mail address
  fits the user@domain format.  It also is used to separate the username
  from the domain. */
var emailPat=/^(.+)@(.+)$/
/* The following string represents the pattern for matching all special
  characters.  We don't want to allow special characters in the address.
  These characters include ( ) < > @ , ; : \ " . [ ]    */
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
/* The following string represents the range of characters allowed in a
  username or domainname.  It really states which chars aren't allowed. */
var validChars="\[^\\s" + specialChars + "\]"
/* The following pattern applies if the "user" is a quoted string (in
  which case, there are no rules about which characters are allowed
  and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
  is a legal e-mail address. */
var quotedUser="(\"[^\"]*\")"
/* The following pattern applies for domains that are IP addresses,
  rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
  e-mail address. NOTE: The square brackets are required. */
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
/* The following string represents an atom (basically a series of
  non-special characters.) */
var atom=validChars + '+'
/* The following string represents one word in the typical username.
  For example, in john.doe@somewhere.com, john and doe are words.
  Basically, a word is either an atom or quoted string. */
var word="(" + atom + "|" + quotedUser + ")"
// The following pattern describes the structure of the user
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
/* The following pattern describes the structure of a normal symbolic
  domain, as opposed to ipDomainPat, shown above. */
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")


/* Finally, let's start trying to figure out if the supplied address is
  valid. */

/* Begin with the coarse pattern to simply break up user@domain into
  different pieces that are easy to analyze. */
var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
  /* Too many/few @'s or something; basically, this address doesn't
    even fit the general mould of a valid e-mail address. */
    alert("E-mail adressen er ikke korrekt udfyldt, check @ og . (punktum)")
    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("E-mail adressen er ikke korrekt udfyldt, check før @")
    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("E-mail adressen er ikke korrekt udfyldt, check IP adresse")
        return false
        }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
    alert("E-mail adressen er ikke korrekt udfyldt, check efter @")
    return false
}

/* domain name seems valid, but now make sure that it ends in a
  three-letter word (like com, edu, gov) or a two-letter word,
  representing country (uk, nl), and that there's a hostname preceding
  the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
  it consists of. */
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>4) {
  // the address must end in a two letter or three letter word.
  alert("E-mail adressen er ikke korrekt udfyldt, check efter sidste . (punktum)")
  return false
}

// Make sure there's a host name preceding the domain.
if (len<2) {
  var errStr="E-mail adressen er ikke korrekt udfyldt, check mellem @ og . (punktum)"
  alert(errStr)
  return false
}

// If we've gotten this far, everything's valid!
return true;
}
//  End -->

Det skal være i ASP