Confirm that the CSS syntax is valid

Is there a way to validate CSS syntax by checking for specific characters like "{", "}", ";", and ":"? I have come up with four checks to ensure the code is valid, such as verifying that the number of opening and closing curly braces match, as well as the number of colons and semicolons. Additionally, I check if it starts with a ".", ends with ";}", and includes various combinations of whitespace.

Are there other validation methods I could apply to confirm the syntax is correct?

Alternatively, does anyone have a regular expression (regex) available that can perform these checks more efficiently? I am new to regex but believe it might be able to handle the validations I mentioned above.

Answer №1

This is the most straightforward regular expression I could come up with:

(([.#]?[a-zA-Z_-0-9]+\ *)+\{([a-zA-Z-])+\ *\:[^;]+;\})+

It does not account for @charset ...; directives and comments (\* ... *\), nor does it validate braces in url(...) or "..." pairs in content: "...", but feel free to incorporate these conditions yourself if necessary.

Answer №2

If you need to check the validity of your CSS code, consider using the w3 css validator tool:

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