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There are many varieties of email validation. This one is simple, but effective. It checks for a
period (.) character anywhere after the 3rd character in the string (this is very cautious, allowing
for one letter domain names e.g. a@b.com; and for @ characters anywhere
after the first character (more possible, as a single letter username is easily possible)
If both of these exist, the function returns true, otherwise it returns false.
function isValidEmail(str) {
return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
}
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To understand how to use the IsValidEmail function to validate a form, see Form Validation function Page.
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View highlighted Comments
 User Comments on 'Javascript Email Validation function'
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Posted by :
 Archive Import (Richard Koudry) at 05:00 on Wednesday, September 18, 2002
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This function is fantastic, but there is one problem:
It accepts an invalid email address, e.g. try@haveago.
is accepted as a valid address. The address should not finish with a dot unless I am mistaken.
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Posted by :
Archive Import (Scott Kreischer) at 18:55 on Tuesday, October 22, 2002
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<script language="javascript"><!--
function verifyEmail(form) {
checkEmail = form.email.value
if ((checkEmail.indexOf('@') < 0) || ((checkEmail.charAt(checkEmail.length-4) != '.') && (checkEmail.charAt(checkEmail.length-3) != '.')))
{alert("You have entered an invalid email address. Please try again.");
form.email.select();
return false;
}
else {
form.method="get";
form.target="_self";
form.action="myscript.cgi";
form.submit();
}
}
//--></script>
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Posted by :
Archive Import (Bikash Biswas) at 02:34 on Saturday, November 30, 2002
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There are certain points to be noted
1) What about domain names ending with .de , .se ,.in
2)The e-mail address like "bikash" is valid one. Try any unix box.
3)The e-mail address need not always contain "." . Again try any Unix box.
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Posted by :
Archive Import (mamtha) at 04:17 on Wednesday, January 15, 2003
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Scott Kreischer' code works for .in,.de etc
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Posted by :
Archive Import (Paul) at 06:29 on Wednesday, February 19, 2003
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function validate()
{
validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;
strEmail = document.form1.email.value;
if (strEmail.search(validRegExp) == -1)
{
alert(" A valid e-mail address is required.\r\Please check you have entered your details correctly.\r\r\ � Paul Holmes 2001-2003");
return false;
}
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Posted by :
Archive Import (DinoBrain) at 14:08 on Wednesday, April 23, 2003
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hi there...
when i enter an e-mail like this: dino@@yahoo.com .it's still accept this e-mail... can u make it better?
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Posted by :
Archive Import (Pedro) at 14:11 on Monday, May 19, 2003
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To validate email format, I've had luck with the following regular expression:
/^\w(\.?[\w-])*@\w(\.?[\w-])*\.[a-z]{2,6}$/i;
However, some browsers (Mac IE?) will result in an alert if there is an underscore. Any ideas why?
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Posted by :
Archive Import (murali) at 04:34 on Saturday, June 21, 2003
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THe email validation should check for the postition of @ and the (.) and the last 3 characters after dot.a maximum length of email not just @ and .
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Posted by :
Archive Import (William) at 03:48 on Tuesday, August 12, 2003
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this is the best I found and it works!
function isEmail(string) {
if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
return true;
else
return false;
}
For the explanation:
http://tech.irt.org/articles/js049/index.htm
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Posted by :
Archive Import (goddy) at 13:55 on Wednesday, August 27, 2003
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i need the function of e-mail to be state out for me
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Posted by :
 sai_cool at 22:39 on Thursday, April 14, 2005
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Can any body provide me a solution of running a c++ code using Java.Is there any command.
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