How do I match a number with regex in gsub and insert a value?

Question

I need to replace a string like " 123456 " to " ,123456 ".

I tried this.

address = address.gsub(/\d{6}/, "")

But I don't know how tell gsub to use the value matched to concatenate with " , ".

Answer 1

我在这里找到了答案：

address.gsub /(\d{6})/, ',\1'

Answer 2

address.gsub! /^/, ','

要么你只需要这个，要么你没有显示足够的背景。