Get all shortcodes in a chunk of text and replace them in place using these two functions

rnb-shortcode-helpers.php

<?php

class rnb {

  function __construct()  {
   // nothing here.
  }

  // insert loads of functions here

  public static function has_shortcode($text){
    if(strpos($text, '[') !== false) {
      preg_match_all('/' . get_shortcode_regex() . '/s', $text, $matches, PREG_SET_ORDER);
      if (!empty( $matches)){
        return $matches;
      }
    }
    return false;
  }

  public static function do_shortcodes($matches, $text){
    // expecting $matches to be a valid output from self::has_shortcode
    foreach($matches as $match){
      $text = str_replace($match[0], do_shortcode($match[0]), $text);
    }
    return $text;
  }

}