Remove Shortcodes from excerpt

functions.php

  function custom_excerpt($text = '') {
	$raw_excerpt = $text;
	if ( '' == $text ) {
		$text = get_the_content('');
        $text = strip_shortcodes( $text );
		$excerpt_length = apply_filters('excerpt_length', 50);
		$excerpt_more = apply_filters('excerpt_more', ' ' . '...');
		$text = wp_trim_words( $text, $excerpt_length, $excerpt_more );
	}
	return apply_filters('wp_trim_excerpt', $text, $raw_excerpt);
	}
	remove_filter( 'get_the_excerpt', 'wp_trim_excerpt'  );
	add_filter( 'get_the_excerpt', 'custom_excerpt'  );