How to change style attribute of an element dynamically

How can I change a style in the content (without having to change the content in all my pages)?

To change all the <h3> tags to <h2>, add this code to your functions file or plugin:

function wpster_change_h3_to_h2($content) {
$content = preg_replace('/<h3(.*)>(.*)<\/h3>/', '<h2$1>$2</h2>', $content);
return $content;
add_filter('the_content', 'wpster_change_h3_to_h2', 9999);

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