Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!news.dougwise.org!nntpfeed.proxad.net!proxad.net!feeder1-2.proxad.net!usenet-fr.net!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!talisker.lacave.net!lacave.net!not-for-mail
From: 7stud -- <bbxx789_05ss@yahoo.com>
Newsgroups: comp.lang.ruby
Subject: Re: String.gsub with regex and block
Date: Thu, 7 Apr 2011 13:22:36 -0500
Organization: Service de news de lacave.net
Lines: 56
Message-ID: <bd4f08a899f7957c6f4de796256a539b@ruby-forum.com>
References: <0be3e165974797b12de3053911b6f7e2@ruby-forum.com> <8af1e658a94490797feb1e89a54b7a53@ruby-forum.com>
NNTP-Posting-Host: bristol.highgroove.com
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
X-Trace: talisker.lacave.net 1302200681 78259 65.111.164.187 (7 Apr 2011 18:24:41 GMT)
X-Complaints-To: abuse@lacave.net
NNTP-Posting-Date: Thu, 7 Apr 2011 18:24:41 +0000 (UTC)
In-Reply-To: <8af1e658a94490797feb1e89a54b7a53@ruby-forum.com>
X-Received-From: This message has been automatically forwarded from the ruby-talk mailing list by a gateway at comp.lang.ruby. If it is SPAM, it did not originate at comp.lang.ruby. Please report the original sender, and not us. Thanks! For more details about this gateway, please visit: http://blog.grayproductions.net/categories/the_gateway
X-Mail-Count: 381142
X-Ml-Name: ruby-talk
X-Rubymirror: Yes
X-Ruby-Talk: <bd4f08a899f7957c6f4de796256a539b@ruby-forum.com>
Xref: x330-a1.tempe.blueboxinc.net comp.lang.ruby:2480

Brian Candler wrote in post #991490:
> Alexey Petrushin wrote in post #991484:
>> Probably a stupid question, but is there a way to use :gsub replacement
>> without $0 $1 $2 $3 (and without "\0\1\2\3")?
>
> There is also $~ (Regexp.last_match); $1/$2/etc are just a facade.
>
>> I would prefer something like:
>>
>>     "John Smith".gsub /(.+)\s(.+)/ do |name, family|
>>       p [name, family]
>>
>>       # instead of this
>>       p [$1, $2]
>>     end
>
> "John Smith".gsub /(.+)\s(.+)/ do
>   name, family = $~.captures
>   p [name, family]
> end
>

And if you want to avoid writing code in perl:

str = "John Smith"
pattern = /(.+)\s(.+)/

result = str.gsub(pattern) do
  md_obj = Regexp.last_match
  first_name, last_name = md_obj[1], md_obj[2]

  p first_name, last_name
end

Or to avoid any indexing, you could do this:

str = "John Smith"
pattern = /(.+)\s(.+)/

result = str.gsub(pattern) do |match|
  first_name, last_name = match.split
  p first_name, last_name

  "some replacement"
end

puts result

--output:--
"John"
"Smith"
some replacement

-- 
Posted via http://www.ruby-forum.com/.