Allow HTML Tags in WordPress Excerpts

functions.php

<?php
/**
 * Allow HTML Tags in Wordpress Excerpt
 * 
 * @link http://wordpress.stackexchange.com/questions/141125/allow-html-in-excerpt/141136
 */

if ( ! function_exists( 'wpse_custom_wp_trim_excerpt' ) ) : 

	function wpse_custom_wp_trim_excerpt( $wpse_excerpt ) {

	$raw_excerpt = $wpse_excerpt;
		if ( '' == $wpse_excerpt ) {

			$wpse_excerpt = get_the_content( '' );
			$wpse_excerpt = strip_shortcodes( $wpse_excerpt );
			$wpse_excerpt = apply_filters( 'the_content', $wpse_excerpt );
			$wpse_excerpt = str_replace( ']]>', ']]&gt;', $wpse_excerpt );

			//Set the excerpt word count and only break after sentence is complete.
			$excerpt_word_count = 75;
			$excerpt_length = apply_filters( 'excerpt_length', $excerpt_word_count ); 
			$tokens = array();
			$excerptOutput = '';
			$count = 0;

			// Divide the string into tokens; HTML tags, or words, followed by any whitespace
			preg_match_all( '/(<[^>]+>|[^<>\s]+)\s*/u', $wpse_excerpt, $tokens );

			foreach ( $tokens[0] as $token ) { 

				if ( $count >= $excerpt_length && preg_match( '/[\,\;\?\.\!]\s*$/uS', $token ) ) { 
					// Limit reached, continue until , ; ? . or ! occur at the end
					$excerptOutput .= trim( $token );
					break;
				}

				// Add words to complete sentence
				$count++;

				// Append what's left of the token
				$excerptOutput .= $token;
			}

			$wpse_excerpt = trim( force_balance_tags( $excerptOutput ) );

				$excerpt_end = ' <a href="'. esc_url( get_permalink() ) . '">' . '&nbsp;&raquo;&nbsp;' . sprintf( __( 'Read more about: %s &nbsp;&raquo;', 'wpse' ), get_the_title() ) . '</a>'; 
				$excerpt_more = apply_filters( 'excerpt_more', ' ' . $excerpt_end ); 

				$wpse_excerpt .= $excerpt_more; /* Add read more in new paragraph */

			return $wpse_excerpt;   

		}
		return apply_filters( 'wpse_custom_wp_trim_excerpt', $wpse_excerpt, $raw_excerpt );
	}

endif; 

remove_filter( 'get_the_excerpt', 'wp_trim_excerpt' );
add_filter( 'get_the_excerpt', 'wpse_custom_wp_trim_excerpt' ); 

Is there a way to have the 'Read More' show up after certain tags eg. <'pre'> <'code'> that would be perfect for formatted posts & the option above for word count = covers everything!

thanks matey!

donde debo colocar este código? no consigo hacerlo funcionar en el extract(); del sitio web http://www.fim-isde2016.es

Is there a way this could work for shortcodes? Using those in an excerpt?