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getBlockContent()

If you don't already have a getBlockContent() helper, you can create one.

Helper Function

Add this to app/Helpers/helpers.php (or wherever your global helper functions are):

if (!function_exists('getBlockContent')) {

    function getBlockContent($content, $label)
    {
        preg_match_all('/<!--label:(.*?)-->(.*?)(?=(<!--block-->|$))/s', $content, $matches, PREG_SET_ORDER);

        foreach ($matches as $match) {
            if (trim($match[1]) == $label) {
                return trim($match[2]);
            }
        }

        return '';
    }

}

Usage

{{ getBlockContent($post->content, 'Label') }}
{!! getBlockContent($post->content, 'Short Description') !!}
{{ getBlockContent($post->content, 'Tags') }}

Even Better Version (Parses Only Once)

Since you're calling it multiple times for the same post, it's more efficient to parse the content once.

Helper

if (!function_exists('getContentBlocks')) {

    function getContentBlocks($content)
    {
        preg_match_all('/<!--label:(.*?)-->(.*?)(?=(<!--block-->|$))/s', $content, $matches, PREG_SET_ORDER);

        $blocks = [];

        foreach ($matches as $match) {
            $blocks[trim($match[1])] = trim($match[2]);
        }

        return $blocks;
    }

}

Blade

@php
    $blocks = getContentBlocks($post->content);
@endphp

{{ $blocks['Label'] ?? '' }}

{!! $blocks['Short Description'] ?? '' !!}

@foreach(explode(',', $blocks['Tags'] ?? '') as $tag)
    <span class="tag">{{ trim($tag) }}</span>
@endforeach

This second approach is recommended because it parses the content only once per post instead of running the regular expression three separate times. It will be noticeably more efficient if you have many posts.