From: Robert Klemme <shortcutter@...>
Date: 2012-09-03T18:00:43+09:00
Subject: Re: Extract # Number from a string

On Mon, Sep 3, 2012 at 9:44 AM, Brian Candler <lists@ruby-forum.com> wrote:
> 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

Or use String#[]:

irb(main):006:0> arr = ["this is _ a 76string / #123 like 456",
irb(main):007:1* "435 bill#198777 bgt",
irb(main):008:1*  "my_name#9_is?"]
=> ["this is _ a 76string / #123 like 456", "435 bill#198777 bgt",
"my_name#9_is?"]
irb(main):009:0> arr.map {|s| s[/(?<=#)\d+/]}
=> ["123", "198777", "9"]

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/