Question

I was learning about how to write a plugin in WordPress and what my plugin is supposed to do is to replace all

`code`

and make them

<span class="code">code</span>

My Code

function format_code($content) {
    $match = preg_match_all('/`.+\`/', $content, $matches);

    if($match)
    {  
        $theContent = preg_replace('/`.+\`/', '<span class="code">$0</span>', $content);
        $theContent = preg_replace('/`/', '', $theContent);
    }  

    else  
    {  
        $theContent = $content;  
    }   

    return $theContent; 
}

add_filter('the_content', 'format_code');

I have been able to do this `code` but to remove the (`) I used this [I basically removed all the `]

$theContent = preg_replace('/`/', '', $theContent);

Is there any other method to do this?

Answer 1

You can use capturing brackets and ‘$1’ in your replacement:

$theContent = preg_replace('/`(.+)\`/', '<span class="code">$1</span>', $content);

(Is that what you meant?)

As an aside, why do you escape your second backtick but not the first in that regex?

Also, you may want to consider having your regex:

/`([^`]+)`/

To avoid, for example, "This is ' code ' and this is more ' code '" being replaced by "This is <span class="code">code ' and this is more ' code</span>", because the .+ was greedy and matched too much. (Replace the single quotes with the backticks in the example I gave, I can’t get the literal backticks to appear with this wiki markup!)