Wordpress: Remove auto paragraphs from shortcode content

functions.php

/**
 * Don't auto-p wrap shortcodes that stand alone
 *
 * Ensures that shortcodes are not wrapped in <<p>>...<</p>>.
 *
 * @since 2.9.0
 *
 * @param string $pee The content.
 * @return string The filtered content.
 */
function shortcode_unautop( $pee ) {
  global $shortcode_tags;

	if ( empty( $shortcode_tags ) || !is_array( $shortcode_tags ) ) {
		return $pee;
	}

	$tagregexp = join( '|', array_map( 'preg_quote', array_keys( $shortcode_tags ) ) );

	$pattern =
		  '/'
		. '<p>'                              // Opening paragraph
		. '\\s*+'                            // Optional leading whitespace
		. '('                                // 1: The shortcode
		.     '\\['                          // Opening bracket
		.     "($tagregexp)"                 // 2: Shortcode name
		.     '(?!)'                   // Not followed by word character or hyphen
		                                     // Unroll the loop: Inside the opening shortcode tag
		.     '[^\\]\\/]*'                   // Not a closing bracket or forward slash
		.     '(?:'
		.         '\\/(?!\\])'               // A forward slash not followed by a closing bracket
		.         '[^\\]\\/]*'               // Not a closing bracket or forward slash
		.     ')*?'
		.     '(?:'
		.         '\\/\\]'                   // Self closing tag and closing bracket
		.     '|'
		.         '\\]'                      // Closing bracket
		.         '(?:'                      // Unroll the loop: Optionally, anything between the opening and closing shortcode tags
		.             '[^\\*+'             // Not an opening bracket
		.             '(?:'
		.                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag
		.                 '[^\\*+'         // Not an opening bracket
		.             ')*+'
		.             '\\[\\/\\2\\]'         // Closing shortcode tag
		.         ')?'
		.     ')'
		. ')'
		. '\\s*+'                            // optional trailing whitespace
		. '<\\/p>'                           // closing paragraph
		. '/s';

	return preg_replace( $pattern, '$1', $pee );
}

// All we have to do is apply this filter after the content has gone through the wpautop() function, to do this all we have to do is change the order of when these filters work by using the following code.

remove_filter( 'the_content', 'wpautop' );
add_filter( 'the_content', 'wpautop' , 99);
add_filter( 'the_content', 'shortcode_unautop',100 );