@spalger/kibana/src/ui/public/index_patterns/_pattern_to_wildcard.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

define(function (require) {
  return function PatternToWildcardFn() {
    return function (format) {
      var wildcard = '';
      var inEscape = false;
      var inPattern = false;

      for (var i = 0; i < format.length; i++) {
        var ch = format.charAt(i);
        switch (ch) {
          case '[':
            inPattern = false;
            if (!inEscape) {
              inEscape = true;
            } else {
              wildcard += ch;
            }
            break;
          case ']':
            if (inEscape) {
              inEscape = false;
            } else if (!inPattern) {
              wildcard += ch;
            }
            break;
          default:
            if (inEscape) {
              wildcard += ch;
            } else if (!inPattern) {
              wildcard += '*';
              inPattern = true;
            }
        }
      }

      return wildcard;
    };
  };
});