kibana-123/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

export default function PatternToWildcardFn() {
  return function (format) {
    let wildcard = '';
    let inEscape = false;
    let inPattern = false;

    for (let i = 0; i < format.length; i++) {
      let 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;
  };
};