Validator w3 check email

W3C (World Wide Web Consortium) provides a validator tool to check the validity of HTML, CSS, and other web-related documents. However, they do not have a specific tool to validate email addresses.

But, you can use the following regular expression to validate an email address using W3C's HTML5 pattern attribute:

<input type="email" pattern="[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}">

This pattern matches most common email address formats, but it's not foolproof and may not validate all valid email addresses. It's also important to note that email address validation is a complex task and it's recommended to use a dedicated email validation library or service for more accurate results.

Here's a breakdown of the pattern:

• [a-zA-Z0-9._%+-]+ matches one or more of the following characters: letters (both uppercase and lowercase), numbers, dot (.), hyphen (-), underscore (_), percent (%), plus sign (+)
• @ matches the @ symbol
• [a-zA-Z0-9.-]+ matches one or more of the following characters: letters (both uppercase and lowercase), numbers, dot (.), hyphen (-)
• \. matches a period (.) character
• [a-zA-Z]{2,} matches the domain extension (it must be at least 2 characters long)

You can use this pattern in your HTML form to validate the email address input field. However, keep in mind that this is not a foolproof solution and you should consider using a dedicated email validation library or service for more accurate results.

Here's an example of how you can use this pattern in HTML:

<form>
  <label for="email">Email:</label>
  <input type="email" id="email" pattern="[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}">
  <span id="error"></span>
  <button type="submit">Submit</button>
</form>

In this example, the pattern attribute is used to specify the regular expression for email validation. The id attribute is used to identify the input field, and the span element is used to display any error messages.