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Ruby Regular Expresssions

These are some regular expressions that I use in Ruby, which I find useful from time to time.  Sadly some aren't as terse as they would be in Perl, due mostly to the fact that Ruby doesn't support look behind.

Firstly, adding commas to large integers:


>> string = '12345678'
=> '1234567'
>> regex = /(\d)(?=(\d\d\d)+$)/
=> /(\d)(?=(\d\d\d)+$)/
>> string.gsub(regex, '\1,')
=> '12,345,678'
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