I need to do a regex find-replace on the post content of a wordpress site in order to change all existing <h4> tags to <h2> tags. I then need to style the <h4> tags to look like <h2> tags.
My plan was to add a class to the new <h2> tags...
<h4> Some poorly written html </h4>
becomes
<h2 class="pseudo-h4"> Some poorly written html </h2>
I feel like this should be doable with regex, but I just cannot seem to grok the more advanced parts of regex. My current working approach is to use this regex (?<=h4)(.+class=") to capture the 'class=' part of any h4 opening tag and then use $1pseudo-h4 as the substitution string. Once that is done I can go back and replace all h4s without regex because those which are "pseudo-h4s" will already be marked by the class.
I have a few problems...
1 - wp-cli is hanging when I try to run this on wp_posts. Maybe this is normal?
2 - $1pseudo-h4 with a space on the end is needed prevent my class from concatenating with the next class, but when i pass the argument with a space on the end i get "unknown --regex parameter"
3 - In my tester it worked, but I dont actually know why this pattern wont match the tag of a previous element, for instance...
<h4>Sup<h4><p class="extra-cheese">Bla bla<p>
my lookbehind should see the <h4> and .+ should go through as many characters as it needs to hit the "class=" section right?