function emailEmpty(emailStr)
{
if (!emailStr == '')
{
emailCheck (emailStr)
}
else
{
return false
}
}
// Deep Email Validation
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("The email address you provided is not valid! \n \n Check if you provided '@' & '.' symbol.")
return false
}
var user=matchArray[1]
var domain=matchArray[2]
if (user.match(userPat)==null)
{
alert("The email address you provided is not valid! \n \n It's username seems invalid.")
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
}
var domainArray=domain.match(domainPat)
if (domainArray==null)
{
alert("The email address you provided is not valid! \n \n It's domain name seems invalid.")
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)
{
alert("The email address you provided is not valid! \n \n The address must end in a three-letter domain, or two letter country.")
return false
}
if (len<2)
{
var errStr="The email address you provided is not valid! \n \n This address is missing a hostname!"
alert(errStr)
return false
}
return true;
}