Verifier l' email dans un formulaire

function bonmail(mailteste)

{
	var reg = new RegExp('^[a-z0-9]+([_|\.|-]{1}[a-z0-9]+)*@[a-z0-9]+([_|\.|-]{1}[a-z0-9]+)*[\.]{1}[a-z]{2,6}$', 'i');

	if(reg.test(mailteste))
	{
		return(true);
	}
	else
	{
		return(false);
	}
}

<SCRIPT language="JavaScript">
<!--

function VerifMail()
	{
	a = document.Verif.Mail.value;
	valide1 = false;
	
	for(var j=1;j<(a.length);j++){
		if(a.charAt(j)=='@'){
			if(j<(a.length-4)){
				for(var k=j;k<(a.length-2);k++){
					if(a.charAt(k)=='.') valide1=true;
				}
			}
		}
	}
	if(valide1==false) alert("Veuillez saisir une adresse email valide.");
	return valide1;
	}

//-->
</SCRIPT>

onsubmit="return VerifMail();"

isEmail = function(emailStr) {
	var checkTLD = 1;
	var knownDomsPat = /^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum|fr)$/;
	var emailPat = /^(.+)@(.+)$/;
	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 +")*$");
	var matchArray = emailStr.match(emailPat);
	if (matchArray == null) { return false; }
	var user = matchArray[1];
	var domain = matchArray[2];
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i) > 127) { return false; }
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i) > 127) { return false; }
	}
	if (user.match(userPat) == null) { return false; }
	var IPArray=domain.match(ipDomainPat);
	if (IPArray != null) {
		for (var i=1; i<=4; i++) {
			if (IPArray[i] > 255) { return false; }
		}
		return true;
	}
	var atomPat = new RegExp("^" + atom + "$");
	var domArr = domain.split(".");
	var len = domArr.length;
	for (i=0; i<len; i++) {
		if (domArr[i].search(atomPat) == -1) { return false; }
	}
	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) { return false; }
	if (len < 2) { return false; }
	return true;
}

<script language="javascript">
<!--
function arobaceok(EMAIL)
{
var a=document.forms[0].EMAIL.value;
var test="" + a;
for(var k = 0; k < test.length;k++)
{
var c = test.substring(k,k+1);
if(c == "@")
{
return true;
}
}
alert("Votre E-mail, Merci");
return false;
}
//-->
</script>

<form method=post action="post" name="AVIS" OnSubmit="return arobaceok(EMAIL)">

//Verifie l'adresse E-Mail
function verifmail(adrr){
  var reg= /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,})+$/;
  if(reg.test(ch1)==true) windows.alert(ch1," est une adresse valide");
  else windows.alert(ch1," n'est pas une adresse valide");  
}