From: Robert Klemme <shortcutter@...>
Date: 2009-08-05T19:55:10+09:00
Subject: Re: remove commas from string

2009/8/5 Lars Haugseth <njus@larshaugseth.com>:
> * Jason Lillywhite <jason.lillywhite@gmail.com> wrote:
>>
>> I have following string:
>>
>> s = "B747-400, 8,357 miles, 561 mph, 4 Pratt & Whitney PW 4056
>> turbofans, 56,000 lbs."
>>
>> I want to remove the comma only from the numbers (8,357 miles and 56,000
>> lbs) separating the thousands. I want the string to read as follows:
>>
>> "B747-400, 8357 miles, 561 mph, 4 Pratt & Whitney PW 4056 turbofans,
>> 56000 lbs."
>
> Ruby 1.9 supports look-behind in regular expressions (Ruby 1.8
> only supports look-ahead):
>
>  $ irb1.9
>
>  irb(main):001:0> s = "B747-400, 8,357 miles, 561 mph, 56,000 lbs."
>  => "B747-400, 8,357 miles, 561 mph, 56,000 lbs."
>
>  irb(main):002:0> s.gsub(/(?<=\d),(?=\d)/, '')
>  => "B747-400, 8357 miles, 561 mph, 56000 lbs."

I'r rather do this to be a bit more robust:

irb(main):003:0> s.gsub(/(?<=\d),(?=\d{3})/, '')
=> "B747-400, 8357 miles, 561 mph, 56000 lbs."

Kind regards

robert

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