From: Nick Brown <nick@...>
Date: 2009-08-06T22:32:50+09:00
Subject: Re: remove commas from string

Ruby has the neat ability to pass a block to gsub. This can be a more 
versatile solution than using backreferences. It also allows Jason to 
use his original, straight-forward regex. The matched string is passed 
to the block, and whatever the block evaluates to is used as the 
replacement string. Check it out:

irb(main):012:0> s
=> "B747-400, 8357 miles, 561 mph, 4 Pratt & Whitney PW 4056 turbofans, 
turbofans, 56,000 lbs."
irb(main):013:0> s.gsub(/\d+,\d+/) { |subs| subs.gsub(',', '') }
=> "B747-400, 8357 miles, 561 mph, 4 Pratt & Whitney PW 4056 turbofans, 
turbofans, 56000 lbs."
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