给数字添加逗号 [英] Adding commas to a number

问题描述

我正在尝试将 1234567 之类的数字变为 1,234,567，但需要一些帮助.我的想法是我可以使用 \d{3} 拆分，然后加入 , .但问题是 \d{3} 从另一端将它分组，所以它就像我不想要的 123,456,7.

I'm trying to make a number like 1234567 go to be 1,234,567, but need some help. My thoughts were that I could use a split with \d{3} and then join a , to that. The problem with this though is that \d{3} groups it from the other end so it would be like 123,456,7 which I don't want.

非常感谢您的帮助！

推荐答案

我会使用 Rails 的 ActiveSupport(即使我没有将 Rails 用于实际应用程序)，它也可以针对当前语言环境正确格式化.如果您还没有使用 Rails，则需要安装 gem:

I'd use Rails' ActiveSupport (even if I wasn't using Rails for the actual application), which also formats it properly for the current locale. If you aren't already using Rails, you'll need to install the gem:

gem install activesupport

然后，像这样要求它:

require "active_support/core_ext"

然后你可以这样做:

=> ActiveSupport::NumberHelper.number_to_delimited(1234567)
=> "1,234,567"

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