Regular expressions (abbreviated regex) are terms that define a search pattern to focus on a specific part of a string for a specific purpose (e.g. to find/replace a word).

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How to handle a post before publishing?

I want to do a regex match to each post before it gets published, and if the regex fails to match, delete the post entirely, what hook should I use?
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205 views

Regex in add_rewrite_tag not accepting OR operators?

I am trying to add a custom field to the post permalinks by using a combo of add_rewrite_tag and applying a post_link filter. What I am aiming for is something like this: ...
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155 views

Processing shortcodes in groups (separated by line breaks)?

The Project I'm working on a plugin to resize and embed rows of images using shortcodes that will be converted into <img> tags. In most cases there will be multiple images per row, and the ...
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34 views

Using preg_replace() with the_content filter

I am trying to append a php query to the end of links from my website to a sponsor site using the_content filter and preg_replace(). I have tested my regex expression on regexr.com and it works also ...
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43 views

RegExp to EXCLUDE strip HTML (FOR SOMME) comments

I'm using this function to remove HTML comments from my code to save loading time: // Remove unwanted HTML comments function remove_html_comments($content = '') { return ...
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1answer
53 views

regEx wp core file

I have an issue with the way WordPress handles creating a page anchor. The page anchor button is already defined in the WordPress TinyMCE code.. and can be added using either the Ultimate Tinymce or ...
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318 views

Rewrite Rule & Regex - Extract 'cat-name' and 'page-number' from http://domain.com/custom-post-type/category/cat-name/page/page-number

I have an URL formatted so: http://domain.com/custom-post-type/category/cat-name/page/page-number I need to extract: cat-name and page-number So that in my functions.php, I can create the custom ...
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156 views

Avoid too long words in a post title, post content or comment but only if its not a url

I want to prevent users from posting things like "aaaadfgdfgsdfgdaaaadsfgsdfgaaasdfgdfaaadfgsdfgaaaaaaaajahkjhkahkkjkjhaa..." which would not only be annoying but would certainly break the content div ...
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Removed custom post type slug but not working for child pages

There are many discussions going about to handle child pages for custom post types were the custom post type slug has been removed. This results into an 404 because Wordpress can't match a valid ...
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77 views

Correct regex for Nginx FastCGI cache?

https://codex.wordpress.org/Nginx#Nginx_fastcgi_cache currently has the following regex: # Don't cache uris containing the following segments if ($request_uri ~* ...
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408 views

Compare meta_query with a Regular Expression and do a less-than operation on it

I have the problem that my client is using a theme which stores options of items in a serialized way in the post_meta table. I already found out that this is not the best way to save values ...
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89 views

Regex to turn embedded images in to attachments

I've got a blog that has all images embedded in each post rather than a thumbnail linking to an attachment page which is what I'd like. I understand from this question that no plugin (like Regenerate ...
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115 views

What add_rewrite_tag()'s RegEx matches against?

I'm trying to figure out wether I can specify the position of the string to match (i.e. immediately after the domain) to reduce the chances of matching something else, but I don't even know what the ...
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195 views

Struggling with add_rewrite_rule

I've read this: Wordpress redirection to get url friendly That led me to this: 1) wp.tutsplus.com/tutorials/creative-coding/the-rewrite-api-the-basics/ 2) ...
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18 views

Help with complex WP Regex express for .htaccess

I managed to do a proper regex redirect for one of our 10 year old sites which has gone through a series of pretty permalink changes over the years, but now having trouble sorting this out for two ...
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Why is my script's regex having its backslash removed?

One of my company's child themes requires customization. I am customizing using jQuery and have noticed in my function's regex (function lives in the "scripts" section of "Pages"--->My Page) that ...
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25 views

Redirection plugin and Regex in “Search”

I'm tried to search a way to make a redirect 301 from the search box of my old site to my new site with Redirection plugin, for example: Old - /?s=(.*) Target - http://www.example.com/?s=$1 but ...
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27 views

How to rediect old canonical links to new

I recently noticed wordpress 4.x is not redirecting old canonical links to the new format and gives a 404 error in crawl and where ever referenced. I have checked this Yoast to get some help on the ...
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57 views

Regex replace on the fly

Heres the example content on all my post <img width="550" height="486" src="http://www.xyz.com/wp-content/uploads/2014/12/-550x550-550x486.jpg" /> <img width="760" height="486" ...
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97 views

Add class to all parent elements inside the_content

Is there a way to add a class to all parent elements inside the_content? My problem is I'm using this kind of css selector: .post_content>* {margin-bottom:10px;} This is to due with mostly ...