JavaScript之正则匹配索引、RegExp、matchAll、reduce、concat、toString、split、includes、String、/d

该提案提供了一个新的/d，用来获取每个匹配的开始位置和结束位置信息。

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let str = 'The question is TO BE, or not to be, that is to be. is to do.',
	regex = /to/gd,
	arr = [...str.matchAll(regex)].reduce((pre, cur) => (pre.concat([cur.indices[0]])), []);

for (let i = 0; i < str.length; i++) if (arr.toString().split(',').includes(String(i))) console.log(str[i]);