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: …

May 18, 2012 · It is possible, if you're using a browser which supports the CSS :valid pseudo-class and the pattern validation attribute on inputs-- which includes most modern browsers …

May 2, 2025 · The pattern attribute is an attribute of the text, tel, email, url, password, and search input types. The pattern attribute, when specified, is a regular expression which the input's …

If all you need is a styling indicator, you can use pure CSS for this: input[pattern]:invalid{ color:red; } When using pattern, the onsubmit validation is automatically done by the browser (does not …

Sep 2, 2020 · We can use the :required, :optional, :valid and :invalid pseudo-classes coupled with HTML5 form validation attributes like required or pattern to create very visually engaging …

Apr 21, 2021 · Let’s define a rule to add using the pattern attribute. In this case, we’ll specify that the username should only consist of lowercase letters; no capital letters, numbers or other …

Learn about the HTML pattern Attribute. View description, syntax, values, examples and browser support for the HTML pattern Attribute.

Aug 29, 2024 · The HTML pattern attribute is used with <input> elements to specify a regular expression that the input’s value must match for the form to be submitted. It enforces specific …

The pattern attribute on an <input> tag specifies a regular expression which validates the input data before form submission. The validation takes places just before the form is submitted.

Apr 12, 2023 · Using the pattern attribute of an input element allows you to add basic data validation without resorting to JavaScript. It works by matching the input value against a …