Extract values from shortcode WordPress

extract_values_from_shortcode_wordpress.php

<?php

$shortcode = '[gallery id="123"]' // Sample shortcode
preg_match_all( '/' . get_shortcode_regex() . '/s', $shortcode, $matches ); // 
    $out = array();
        if ( isset( $matches[2] ) ) {
            foreach ( (array) $matches[2] as $key => $value ) {
                if ( 'av_product_small_info' === $value ) { // Shortcode name
                    $out = shortcode_parse_atts( $matches[3][ $key ] );
                }
            }
        }
        
?>