You can retrieve posts in WordPress that contain a certain string in their meta key using the meta_query parameter in the get_posts function.

Here’s an example:

phpCopy code$args = array(
    'posts_per_page' => -1,
    'meta_query' => array(
            'key' => '_your_meta_key',
            'value' => 'your_value',
            'compare' => 'LIKE'
$posts = get_posts( $args );

In this example, _your_meta_key is the name of the meta key that you want to search for the string in, and your_value is the string that you want to match. The compare parameter is set to LIKE, which means that it will retrieve posts where the meta key contains the value.

You can then loop through the $posts array to display the post data in your WordPress theme.

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