オブジェクトのキー名を正規表現で調べる

 const data = {id1: 100, name: 'foo', id2: 200};
 const val = (() => {
     const key = Object.keys(data).find(x => x.match(/^id[0-9]/));
     return data[key];
 })();
 console.log(val);
 
 => 100

 const data = {id1: 100, name: 'foo', id2: 200};
 const val = data[Object.keys(data).find(x => x.match(/^id[0-9]/))];
 console.log(val);
 
 => 100

参考

https://github.com/micromatch/micromatch