Java-Scripts.net

Email Format Verifier

Catch typos early. This script monitors the input field and uses Regular Expressions to verify that the text matches standard email syntax.

Start typing to verify...

Copy the Script

<script>
function validateEmail(input) {
    var validRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    var msg = document.getElementById("msg");
    
    if (input.value.match(validRegex)) {
        msg.style.color = "green";
        msg.innerHTML = "Valid Email Format";
    } else {
        msg.style.color = "red";
        msg.innerHTML = "Invalid Format";
    }
}
</script>

<input type="text" onkeyup="validateEmail(this)">
<span id="msg"></span>

Frequently Asked Questions

No. Regex only checks if the *format* looks correct (syntax). It cannot verify if the email address actually exists or if the inbox is full. You need server-side verification for that.

A standard comprehensive regex: `/^[^\s@]+@[^\s@]+\.[^\s@]+$/`. This covers 99% of valid email cases.

Yes. You can disable the submit button until the email format is valid.