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regexp-2.md

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对字符串var str = "1000000000" 进行科学计数法，比如结果是1.000.000.000 ☆☆☆☆☆

答案：/(?=(\b)(\d{3})+$)/g

var reg = /(?=(\B)(\d{3})+$)/g;
var str = "1000000000";
str.replace(reg,".");