Ruby On Rails nofollow to non internal link

Question

I have a text paragraph where it may have external or internal URL. User will enter this text. So, I want external links should add rel=nofollow and internl links won't be having rel=nofollow attribute.

Internal links can be:

 <a href=http://www.mysite.com"> My Site </a>

or
<a href="/articles/1-world-cup-cricket-2015"> World cup schedule </a>

External link is as usual anything...

My current function is adding rel=nofollow to all internal and external links.

def add_nofollow html
  html.gsub(/\<a href=["'](.*?)["']\>(.*?)\<\/a\>/mi, '<a href="\1" rel="nofollow" target="_new" >\2</a>')
end

The question is how do I add the rel=nofollow to external links only?

Please, begging for people not to downvote your post is pathetic and just adds needless clutter. Don't keep doing this. — Cody Gray - on strike, Aug 02 '13 at 09:01
@CodyGray you are right. But I find some people don't read content but just title and downvote. sorry I will remove by above comment. — Manish Shrivastava, Aug 02 '13 at 09:11

score 2 · Answer 1 · answered Aug 02 '13 at 09:02

2

see this link for my example. is use regex <a href=["']((http://www.mysite.com)(/.*?){0,1}|/.*?)["']\>(.*?)\<\/a\> to get all link match your internal link.

answered Aug 02 '13 at 09:02

Angga

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Thanks it help me a lot to complete follow method written by me. – Manish Shrivastava Aug 05 '13 at 11:57

score 1 · Accepted Answer · edited Mar 05 '15 at 16:24

In Ruby on Rails you can use regex to find urls and add rel=nofollow to them.

def add_nofollow html

 html.scan(/(\<a href=["'].*?["']\>.*?\<\/a\>)/).flatten.each do |link|
   if link.match(/\<a href=["'](http:\/\/|www){0,1}((localhost:3000|mysite.com)(\/.*?){0,1}|\/.*?)["']\>(.*?)\<\/a\>/)
    else
    link.match(/(\<a href=["'](.*?)["']\>(.*?)\<\/a\>)/)
    html.gsub!(link, "<a href='#{$2}' rel='nofollow' target='_new' >#{$3}</a>" )
    end
  end
  html
end

`

Cheers!

Ruby On Rails nofollow to non internal link

2 Answers2