Example
An HTML form with an input field that can contain only three letters (no numbers or special characters):
<form action="demo_form.asp">
Country code: <input type="text" name="country_code"
pattern="[A-Za-z]{3}"
title="Three letter country code">
<input type="submit">
</form>
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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.
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 | Not supported | 9.6 |
Differences Between HTML 4.01 and HTML5
The pattern attribute is new in HTML5.
Syntax
<input pattern="regexp">
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 6 or more characters:
<form action="demo_form.asp">
Password: <input type="password" name="pw" pattern=".{6,}" title="Six or
more characters">
<input type="submit">
</form>
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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:
<form action="demo_form.asp">
Password: <input
type="password" name="pw" pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}" title="Must contain
at least one number and one uppercase and lowercase letter, and at least 8
or more characters">
<input type="submit">
</form>
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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, you can only write 2 to 3 letters from a to z:
<form action="demo_form.asp">
E-mail: <input type="email"
name="email" pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,3}$">
<input type="submit">
</form>
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Example
An <input> element with type="search" that CANNOT contain the following characters: ' or "
<form action="demo_form.asp">
Search: <input
type="search" name="search" pattern="[^'\x22]+" title="Invalid input">
<input type="submit">
</form>
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Example
An <input> element with type="url" that must start with http:// or https:// followed by at least one character:
<form action="demo_form.asp">
Homepage:
<input type="url" name="website" pattern="https?://.+" title="Include
http://">
<input type="submit">
</form>
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