text: function delLeftMost(self, find) {
    var s = self.s;
    for (var i = 0; i < s.length; i = i + 1) {
      var f = s.indexOf(find, i);
      if (f != -1) {
         return new self.constructor(s.substr(f + find.length, s.length));
         break;
      }
    }
    return new self.constructor(s);
  };
  
  module.exports = delLeftMost;
  