Ensuring a Value Matches a Pattern
The pattern attribute ensures that a value matches a regular expression. The pattern attribute only results in validation when there is a value. The browser will allow the user to submit the form if the text box is empty. For this reason, this attribute is often used in conjunction with the required attribute.
<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
</head>
<body>
<form method="post" action="http://yourServer/form">
<input type="hidden" name="recordID" value="1234" />
<p>
<label for="name"> Name: <input type="text" id="name"
name="name" pattern="^.* .*$" />
</label>
</p>
<input type="submit" value="Submit" />
</form>
</body>
</html>
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Input Validation:
- Using Input Validation
- Ensuring the User Provides a Value
- Ensuring a Value Is Within Bounds
- Ensuring a Value Matches a Pattern
- Ensuring a Value Is an E-mail Address or URL
- Disabling Input Validation
Related: