Web Reference: Jan 25, 2026 · The pattern attribute, when specified, is a regular expression which the input's value must match for the value to pass constraint validation. It must be a valid JavaScript regular expression, as used by the RegExp type, and as documented in our guide on regular expressions. 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. Jul 11, 2025 · The HTML pattern attribute is used with elements to specify a regular expression that the input's value must match for the form to be submitted. It enforces specific formatting rules, like requiring a certain number of characters or specific character types.
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