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.

Answer 2

there is even simpler solution

line.scan(/\d+/).first