Validate HEX, RGB, HSL & CSS Named Colors Validate color values in HEX, RGB, HSL, and CSS named color formats with live preview.

Under the hood, the tool uses regular expressions to match input strings against known color formats, including HEX, RGB, RGBA, HSL, and HSLA. The `validateColor` function takes an input string, trims it, and then applies a series of tests to determine its validity. For instance, when checking HEX colors, it uses the `match` method with a regex pattern to extract the color code, which is then validated against a set of allowed lengths (3, 4, 6, or 8 characters). If valid, it converts the shorthand notation to full notation and calculates the RGB equivalent using bitwise operations.

The tool also utilizes JavaScript's built-in `parseInt` function to convert color values from strings to integers, which are then used for validation and calculation. For example, when checking RGB colors, it uses `parseInt` to extract the red, green, and blue components from the input string, and then checks if these values fall within the allowed range of 0-255. Additionally, the tool supports alpha channels in RGBA and HSLA formats by parsing the input string for an optional fourth value, which is then used to calculate the alpha channel value.

The `useState` and `useCallback` hooks from React are used to manage the tool's state and handle user interactions, such as input changes and button clicks. When a user inputs a color code, the `handleValidate` function is called, which triggers the `validateColor` function to check the input string against the various color formats. The result is then stored in the component's state using `setResult`, and displayed to the user along with a live preview of the color.

The tool's live preview feature relies on CSS styles to display the validated color, using the `style` attribute to set the background color of a div element. This allows users to see how the color will appear in their web page or application. The tool also includes a list of 148 CSS named colors, which are checked against the input string using the `includes` method. If a match is found, the tool returns a valid result with details about the color, including its name and HEX equivalent.