vendors/tempy.js/strictCheck
    var strictCheck = function(str) {
      if (str[0] === "!") {
        return true;
      }
      var index = 0;
      var pipeIndex = -2;
      var closeSquareIndex = -2;
      var closeCurlyIndex = -2;
      var closeParenIndex = -2;
      var backSlashIndex = -2;
      while (index < str.length) {
        if (str[index] === "*") {
          return true;
        }
        if (str[index + 1] === "?" && /[\].+)]/.test(str[index])) {
          return true;
        }
        if (closeSquareIndex !== -1 && str[index] === "[" && str[index + 1] !== "]") {
          if (closeSquareIndex < index) {
            closeSquareIndex = str.indexOf("]", index);
          }
          if (closeSquareIndex > index) {
            if (backSlashIndex === -1 || backSlashIndex > closeSquareIndex) {
              return true;
            }
            backSlashIndex = str.indexOf("\\", index);
            if (backSlashIndex === -1 || backSlashIndex > closeSquareIndex) {
              return true;
            }
          }
        }
        if (closeCurlyIndex !== -1 && str[index] === "{" && str[index + 1] !== "}") {
          closeCurlyIndex = str.indexOf("}", index);
          if (closeCurlyIndex > index) {
            backSlashIndex = str.indexOf("\\", index);
            if (backSlashIndex === -1 || backSlashIndex > closeCurlyIndex) {
              return true;
            }
          }
        }
        if (closeParenIndex !== -1 && str[index] === "(" && str[index + 1] === "?" && /[:!=]/.test(str[index + 2]) && str[index + 3] !== ")") {
          closeParenIndex = str.indexOf(")", index);
          if (closeParenIndex > index) {
            backSlashIndex = str.indexOf("\\", index);
            if (backSlashIndex === -1 || backSlashIndex > closeParenIndex) {
              return true;
            }
          }
        }
        if (pipeIndex !== -1 && str[index] === "(" && str[index + 1] !== "|") {
          if (pipeIndex < index) {
            pipeIndex = str.indexOf("|", index);
          }
          if (pipeIndex !== -1 && str[pipeIndex + 1] !== ")") {
            closeParenIndex = str.indexOf(")", pipeIndex);
            if (closeParenIndex > pipeIndex) {
              backSlashIndex = str.indexOf("\\", pipeIndex);
              if (backSlashIndex === -1 || backSlashIndex > closeParenIndex) {
                return true;
              }
            }
          }
        }
        if (str[index] === "\\") {
          var open = str[index + 1];
          index += 2;
          var close = chars[open];
          if (close) {
            var n = str.indexOf(close, index);
            if (n !== -1) {
              index = n + 1;
            }
          }
          if (str[index] === "!") {
            return true;
          }
        } else {
          index++;
        }
      }
      return false;
    };