Extract number from string in Ruby

Question

I'm using this code:

s = line.match( /ABCD(d{4})/ ).values_at( 1 )[0] 

To extract numbers from strings like:

ABCD1234
ABCD1235
ABCD1236

etc.

It works, but I wonder what other alternative I have to to this in Ruby?

My code:

ids = [] 
someBigString.lines.each {|line|
   ids << line.match( /ABCD(d{4})/ ).values_at( 1 )[0] 
}

Answer 1

There are many Ruby ways as per http://www.ruby-forum.com/topic/125709

1. line.scan(/d/).join('')
2. line.gsub(/[^0-9]/, '')
3. line.gsub(/[^d]/, '')
4. line.tr("^0-9", '')
5. line.delete("^0-9")
6. line.split(/[^d]/).join
7. line.gsub(/D/, '')

Try each on you console.

Also check the benchmark report in that post.