Extracting shortcodes & attributes from content in WordPress. These helper functions can help extracting shortcodes and their attributes from WordPress content.

helpers.php

<?php

/**
 * Extract shortcodes from content.
 *
 * @param string $content Content containing shortcodes.
 *
 * @return array Array of shortcodes found.
 */
function get_shortcodes_from_content( $content ) {
	$pattern    = get_shortcode_regex();
	$shortcodes = [];
	if ( preg_match_all( '/' . $pattern . '/s', $content, $matches ) ) {
		foreach ( $matches[0] as $key => $value ) {
			$shortcodes[ $key ] = [
				'full_text' => $value,
				'tag'       => $matches[2][ $key ],
				'atts'      => shortcode_parse_atts( $matches[3][ $key ] ),
				'content'   => $matches[5][ $key ],
			];

			if ( ! empty( $shortcodes[ $key ]['atts'] ) ) {
				foreach ( $shortcodes[ $key ]['atts'] as $attr_name => $attr_value ) {
					// Filter numeric keys as they are valueless/truthy attributes.
					if ( is_numeric( $attr_name ) ) {
						$shortcodes[ $key ]['atts'][ $attr_value ] = true;
						unset( $shortcodes[ $key ]['atts'][ $attr_name ] );
					}
				}
			}
		}
	}

	return $shortcodes;
}

/**
 * Find specific shortcodes from given content.
 *
 * @param string       $content Content containing shortcodes.
 * @param string|array $shortcode_tags Shortcode tags to look for.
 *
 * @return array Array of shortcodes found.
 */
function find_shortcodes_in_content( $content, $shortcode_tags = [] ) {
	if ( ! is_array( $shortcode_tags ) ) {
		$shortcode_tags = array_map( 'trim', explode( ',', $shortcode_tags ) );
	}

	$shortcodes = get_shortcodes_from_content( $content );

	foreach ( $shortcodes as $key => $shortcode ) {
		if ( ! in_array( $shortcode['tag'], $shortcode_tags ) ) {
			unset( $shortcodes[ $key ] );
		}
	}

	return $shortcodes;
}