From: Rob Biedenharn <Rob@...>
Date: 2010-02-23T04:22:26+09:00
Subject: Re: How do I use a variable in a regexp search string?

On Feb 22, 2010, at 1:45 PM, joemac wrote:
> On Jan 29, 7:38 pm, Harry Kakueki <list.p...@gmail.com> wrote:
>>> I dont know how to use avariablein a regex searchstring.
>>> ruby seems to only handle hardcoded serachstring in
>>> regex's.   How do you do this.   My code is below.
>>
>> Does this help?
>>
>> str = "abcdef"
>> searchstring = "cd"
>> p str =~ /#{searchstring}/
>>
>> Harry
>
> Hi Folks,
>
> Thanks for all the helpful info.
> It was the #{} syntax that i was missing.
> This also works for the "filename as a varible" situation
> when parsing lots of files:
>
> filenames = ["input1", "input2", "input3"]
>
> for fname in filenames
>   infile = File.open("#{fname}")
>   while line = infile.gets()
>      puts line
>   end
>   puts "================== end file ==================="
> end
>
>
> Very helpfull!
>
> Thanks, --JM

In this case, you're already getting strings in fname so "#{fname}"  
isn't really doing anything useful.

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com