How to clean up posts from inline CSS?

In my blog (https://www.fotov60.com?LSCWP_CTRL=before_optm) up to this point, I had to use inline CSS to give the appearance and size to the text I wanted. Since the last post, I have made adjustments to the CSS sheet by introducing all the appropriate styles and sizes for <p> and the headings, ensuring that the appearance of the post is what I want without the need for inline CSS. The problem now is that I have nearly 1000 posts following the old practices where I used inline CSS, and now I need to remove all that code so that the new CSS sheet is applied, thus matching the style of all posts, cleaning up the code, and optimizing the loading speed. I could remove it manually, but it would be a job that would take me weeks and I could make mistakes. Does anyone have any ideas on how to automate the process of removing all that excess code, so that I can ensure that only the appropriate code remains to work with the styles of the CSS sheet?

I understand the challenge you’re facing with removing the inline CSS from nearly 1000 posts on your blog. Manually removing the code can be time-consuming and prone to errors. Fortunately, there are a few approaches you can consider to automate the process and ensure that only the appropriate code remains for the CSS styles to work seamlessly. One option is to use a find and replace tool in your text editor or development environment, which allows you to search for specific patterns and replace them with the desired code. Another option is to write a script or use a programming language, such as Python, to parse through your posts’ HTML and remove the inline CSS tags programmatically. Additionally, you could explore using a content management system (CMS) or a plugin specifically designed for bulk editing and cleaning up code. These tools often provide functionalities to search and replace code across multiple posts simultaneously. By leveraging these automated approaches, you can save time, reduce the risk of errors, and ensure a consistent style across all your posts. Good luck with optimizing your blog’s loading speed and achieving a cleaner codebase!

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Can you give me an example for Wordpress?