function to validate email in javascript code example

Example 1: javascript regex email

function validateEmail (emailAdress)
{
  let regexEmail = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
  if (emailAdress.match(regexEmail)) {
    return true; 
  } else {
    return false; 
  }
}

let emailAdress = "[email protected]";
console.log(validateEmail(emailAdress));

Example 2: email regex javascript

/* Answer to: "email regex javascript" */

ValidateEmail("[email protected]"); // Must be a string

function ValidateEmail(email) {
	var emailformat = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(String(email).toLowerCase());
	if (email.match(emailformat)) {
    	alert("Nice Email!")
      	return true;
    };
    alert("That's not an email?!")
    return (false);
};

Example 3: Email validation using javascript

function checkEmail() {

    var email = document.getElementById('txtEmail');
    var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

    if (!filter.test(email.value)) {
    alert('Please provide a valid email address');
    email.focus;
    return false;
 }
}

- Call the function on Email textbox

Example 4: how to validate email in node js

var emailRegex = /^[-!#$%&'*+\/0-9=?A-Z^_a-z{|}~](\.?[-!#$%&'*+\/0-9=?A-Z^_a-z`{|}~])*@[a-zA-Z0-9](-*\.?[a-zA-Z0-9])*\.[a-zA-Z](-?[a-zA-Z0-9])+$/;

function isEmailValid(email) {
    if (!email)
        return false;

    if(email.length>254)
        return false;

    var valid = emailRegex.test(email);
    if(!valid)
        return false;

    // Further checking of some things regex can't handle
    var parts = email.split("@");
    if(parts[0].length>64)
        return false;

    var domainParts = parts[1].split(".");
    if(domainParts.some(function(part) { return part.length>63; }))
        return false;

    return true;
}

Example 5: email validation in javascript

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JavaScript form validation - checking email</title>
<link rel='stylesheet' href='form-style.css' type='text/css' />      
</head>
<body onload='document.form1.text1.focus()'>
<div class="mail">
<h2>Input an email and Submit</h2>
<form name="form1" action="#"> 
<ul>
<li><input type='text' name='text1'/></li>
<li> </li>
<li class="submit"><input type="submit" name="submit" value="Submit" onclick="ValidateEmail(document.form1.text1)"/></li>
<li> </li>
</ul>
</form>
</div>
<script src="email-validation.js"></script>
</body>
</html>

Tags:

Javascript Example

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