anchor.diff:  
     if ($('#editor').isPresent()) {
         if (isBrowserSupported()) {
  +          initializeRegexes();
             initializeCodePilot();
             $('.score, #development-environment').show();
             configureEditors();
  
positive.code: 
    var editors = [];
    var editor_for_file = new Map();
  
    var tracepositions_regexes = {
      python: /File "(.+?)", line (\d+)/g,
      java: /(.*\.java):(\d):/g
    };
  
    var tracepositions_regex;
  
    var active_file = undefined;
  
negative.code: 
        // set regex for parsing error traces based on the mode of the main file.
        if( $(element).parent().data('role') == "main_file"){
          tracepositions_regex = regex_for_language.get($(element).data('mode'));
        }
  
        var file_id =  $(element).data('id');
  