From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2011-07-28T02:43:10+09:00
Subject: Re: if condition for pattern matching

On Wed, Jul 27, 2011 at 6:55 PM, kotin 76 <kotin76@yahoo.com> wrote:
> Hi any one can reply for this?
>>   1
>>   2 #!/usr/bin/env ruby
>>   3
>>   5  dev2 = File.readlines("dev_string2.txt")
>>   8
>>   9
>>  10 for i in dev2
>>  11 devstring=i.match(/\/dev\/[\w]+/)

String#match returns a MatchData object. If you want the matched
string use [0] on that. Also, I recommend using another name for i,
something like line. And also use File.foreach if you are doing things
to lines one by one, so that you don't read the entire file into
memory.

>>  12 puts devstring
>>  14     if  devstring =~ %r{/dev/} then

The result of the match of line 11 is obviously going to match this
regular expression too, since it is a subset of the other one.

>>  15     puts "pass"
>>  16     end
>>  17 end
>>
>>
>> but i am not able to print pass. pleas suggest any thing to print pass

So, what I'd do:

File.foreach("dev_string2.txt") do |line|
  if m = line.match(%r{/dev/[\w]+})
    puts "line #{line} passed the test"
  end
end

Hope this helps,

Jesus.