HTML <input> pattern Attribute

The pattern attribute is used to define a regular expression that the input value must match. It helps validate user input before form submission.

• Specifies a pattern or format for the input value.
• Commonly used with text, password, email, and telephone input fields.
• If the entered value does not match the pattern, the form cannot be submitted.

Syntax: 

<input pattern = "regular_exp">

Example: Illustrates the use of pattern attribute in <input> element.