Email Address Validation - JavaScript Made Easy: Free JavaScripts Tutorials Example Code

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Email Address Validation

This is an e-mail address validation function. It allows the usual user@domain syntax, but in addition allows user@[ip] format as well as "User with Spaces"@domain or [ip], all of which are legal syntax, according to W3C. It also checks that the user hasn't done anything silly like having multiple @'s or continuous .'s in the address (e.g. jim@b@c.com and jim@c..b.co.uk). Once more e-mail validator. This script willn't allow a user to type incorrect e-mail address in your form (in a reasonable limits of course) br> Your Email Address:


Insert into <HEAD>
<SCRIPT LANGUAGE="JavaScript"> <!-- Original: Sandeep V. Tamhankar (stamhankar@hotmail.com) --> <!-- This script and many more are available free online at --> <!-- The JavaScript Source!! http://javascript.internet.com --> <!-- Begin function emailCheck(emailStr) { // checks if the e-mail address is valid var emailPat = /^(\".\"\|[A-Za-z]\w)@(\[\d{1,3}(\.\d{1,3}){3}]\|[A-Za-z]\w(\.[A-Za-z]\w)+)$/; var matchArray = emailStr.match(emailPat); if (matchArray == null) { alert("Your email address seems incorrect. Please try again (check the '@' and '.'s in the email address)"); return false; } // make sure the IP address domain is valid var IPArray = matchArray[2].match(/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/); if (IPArray != null) { for (var i=1;i<=4;i++) { if (IPArray[i]>255) { alert("Destination IP address is invalid!") return false; } } } return true; } // End --> </script>

Insert into <BODY>
<center> <form name=emailform onSubmit="return emailCheck(this.email.value);"> Your Email Address: <input type=text name="email"><br> <input type=submit value="Submit"> </form> </center>

Other Options