regular expression expalanation i need

hi......... here is my code could explain it

<html>
<script language = "Javascript">
function checkEmail() {
if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(form.email.value))
{
document.write("You have entered valid email.");
return true;
}
return false; 
}


function ValidateEmail(){
var emailID=document.form.email;

if ((emailID.value==null)||(emailID.value=="")){
alert("Please Enter your Email ID")
emailID.focus()
return false
}
if (checkEmail(emailID.value)==false){
emailID.value=""
alert("Invalid Email Adderess");
emailID.focus()
return false
}
return true
}
</script>
<form name="form" method="post" onSubmit="return ValidateEmail()">
Enter an Email Address : <input type="text" name="email" size="30"><br>
<input type="submit" name="Submit" value="Submit">
</form>
</html>`print("code sample");`

View Answers

May 25, 2012 at 12:58 PM

<html>
<head>
<title>Email validation using regex</title>
<script type="text/javascript">
    function validate() {
        var email = document.getElementById("email").value;
        var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
        if (emailPattern.test(email)) {
            alert("Email Id: " + email);
            return true;
        } else {
            alert("Email Id is not valid!");
            return false;
        }
    }
</script>

</head>
<body>
<h2>Validating Email Id..</h2>
Email Id :
<input type="text" name="email" id="email" />
<input type="submit" value="Submit" onclick="validate();"/>
</body>
</html>

Description: Email pattern is like [email protected]. you have to check the pattern of combination of these two. Sometimes space is also included in it.

         In pattern /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/
            /../(forward slashes) is used to quote your regular expression.
              ^ shows beginning of string.
              [..] matches any letter enclosed with in.
              + shows that preceding character come 1 or more times.
              \. Shows that \ will treat . as a literal. 
              {2,4} shows the range that content having length between 2 to 4.
              $ is used for ending the string.
            test() method takes one argument and check that to the pattern.

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