[JavaScript] String#contains で正規表現マッチができればいいのに ref: http://qiita.com/MizuiroFolder/items/8dcf74a404d5dcf70fe8

example

'foo'.contains('o'); //=> true
'foo'.contains(/o/); //=> true

file0.js

(function(){
  let _contains = String.prototype.contains;
  Object.defineProperty(String.prototype, 'contains', {
    enumerable: false,
    configurable: true,
    writable: true,
    value: function contains(...args){
      let [searchString, position] = args;
      if(searchString != undefined && searchString.constructor === RegExp){
        return searchString.test(this.slice(position));
      }else{
        return _contains.call(this, ...args);
      }
    },
  });
})();