From: Brian Candler <lists@...>
Date: 2012-09-03T16:44:49+09:00
Subject: Re: Extract # Number from a string

Erez Ben shoham wrote in post #1074385:
> Hi
>
> I have a string
> how can i extract the number after the # sign?

Use a reegular expression match.

> old_string = "this is _ a 76string / #123 like 456"

if old_string =~ /#([0-9]+)/
  new_string = $1
else
  puts "Couldn't find it"
end

There are shortcuts, e.g. \d is the same as [0-9]

Google for loads of regular expression tutorials on the Internet. Ruby 
is very similar, with some minor differences (e.g. to match start and 
end of string use \A and \z respectively)

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