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Example
An HTML form with an input field that can contain only three letters (no numbers or special characters):
<label for='country_code'>Country code:</label>
<input type='text' name='country_code'
pattern='[A-Za-z]{3}'><br><br>
<input type='submit'>
</form>
More 'Try it Yourself' examples below.
Definition and Usage
The pattern attribute specifies a regular expression that the <input> element's value is checked against on form submission.
Note: The pattern attribute works with the following input types: text, date, search, url, tel, email, and password.
Tip: Use the global title attribute to describe the pattern to help the user.
Tip: Learn more about regular expressions in our JavaScript tutorial.
Browser Support
The numbers in the table specify the first browser version that fully supports the attribute.
| Attribute | |||||
|---|---|---|---|---|---|
| pattern | 5.0 | 10.0 | 4.0 | 10.1 | 9.6 |
Syntax
Attribute Values
| Value | Description |
|---|---|
| regexp | Specifies a regular expression that the <input> element's value is checked against |
More Examples
Example
An <input> element with type='password' that must contain 8 or more characters:
<label for='pwd'>Password:</label>
<input type='password' name='pwd'
pattern='.{8,}'>
<input type='submit'>
</form>
Example
An <input> element with type='password' that must contain 8 or more characters that are of at least one number, and one uppercase and lowercase letter:
<label for='pwd'>Password:</label>
<input type='password' name='pwd'
pattern='(?=.*d)(?=.*[a-z])(?=.*[A-Z]).{8,}'
>
<input type='submit'>
</form>
Example
An <input> element with type='email' that must be in the following order: characters@characters.domain (characters followed by an @ sign, followed by more characters, and then a '.'
After the '.' sign, add at least 2 letters from a to z:
Patterns Online
<label for='email'>Email:</label>
<input type='email' name='email'
pattern='[a-z0-9._%+-]+@[a-z0-9.-]+.[a-z]{2,}$'>
<input type='submit'>
</form>
Patterns Definition
Example
An <input> element with type='search' that CANNOT contain the following characters: ' or '
<label for='search'>Search:</label>
<input type='search' name='search'
pattern='[^'x22]+'>
<input type='submit'>
</form>
Example
An <input> element with type='url' that must start with http:// or https:// followed by at least one character:
<label for='website'>Homepage:</label>
<input type='url' name='website'
pattern='https?://.+'>
<input type='submit'>
</form>
Patterns In Nature