Function parseQuery

src/codemirror.js:13091–13124

* Extract the regular expression from the query and return a Regexp object. * Returns null if the query is blank. * If ignoreCase is passed in, the Regexp object will have the 'i' flag set. * If smartCase is passed in, and the query contains upper case letters, * then ignoreCas

(query, ignoreCase, smartCase)

     *   through to the Regex object.
     */
    function parseQuery(query, ignoreCase, smartCase) {
      // First update the last search register
      var lastSearchRegister = vimGlobalState.registerController.getRegister('/');
      lastSearchRegister.setText(query);
      // Check if the query is already a regex.
      if (query instanceof RegExp) { return query; }
      // First try to extract regex + flags from the input. If no flags found,
      // extract just the regex. IE does not accept flags directly defined in
      // the regex string in the form /regex/flags
      var slashes = findUnescapedSlashes(query);
      var regexPart;
      var forceIgnoreCase;
      if (!slashes.length) {
        // Query looks like 'regexp'
        regexPart = query;
      } else {
        // Query looks like 'regexp/...'
        regexPart = query.substring(0, slashes[0]);
        var flagsPart = query.substring(slashes[0]);
        forceIgnoreCase = (flagsPart.indexOf('i') != -1);
      }
      if (!regexPart) {
        return null;
      }
      if (!getOption('pcre')) {
        regexPart = translateRegex(regexPart);
      }
      if (smartCase) {
        ignoreCase = (/^[^A-Z]*$/).test(regexPart);
      }
      var regexp = new RegExp(regexPart,
          (ignoreCase || forceIgnoreCase) ? 'i' : undefined);
      return regexp;
    }
    function showConfirm(cm, text) {
      if (cm.openNotification) {
        cm.openNotification('<span style="color: red">' + text + '</span>',