CODEWITHSUNDEEP
jqueryrubyruby-on-rails-3
Lukas Hoffmann
Lukas Hoffmann

Reputation: 617

How to replace part of an input value?

I have an input field where the user can post a link to a facebook page. Right now I am using regex to validate the URL.

URL_regex = /\A(http|https|ftp):\/\/([\w]*)\.([\w]*)\.(com|net|org|biz|info|mobi|us|cc|bz|tv|ws|name|co|me)(\.[a-z]{1,3})?/i

I only want the following four versions to pass the validation:

Then I want to only want to store the "redbull" part in the database. I tried Rubular but I can't figure out the logic of the regex.

Thanks in advance

Found a solution, thx to caley:

  URL_regex = /\A((http|https):\/\/)?(www\.)?facebook\.com\/([\S]+)/i

Upvotes: 1

Views: 134

Answers (4)

zaarg
zaarg

Reputation: 21

You're almost there. You just need to add another capture group.

\A(http|https|ftp):\/\/([\w]*)\.([\w]*)\.(com|net|org|biz|info|mobi|us|cc|bz|tv|ws|name|co|me)\/(\w+)?

or

(http|https:ftp:\/\/)?\w*.\w+.(com|net|org|biz|info|mobi|us|cc|bz|tv|ws|name|co|me)\/(\w+)

irb(main):014:0> if x =~ /\A(http|https|ftp):\/\/([\w]*)\.([\w]*)\.(com|net|org|biz|info|mobi|us|cc|bz|tv|ws|name|co|me)\/(\w+)?/
irb(main):015:1> puts $5
irb(main):016:1> end
redbull
=> nil

Upvotes: 0

Michael Kohl
Michael Kohl

Reputation: 66837

You already got nice answers for regular expressions, but I wanted to point out the URI module:

>> require 'uri' 
#=> true
>> uri = URI.parse "https://www.facebook.com/redbull" 
#=> #<URI::HTTPS:0x000001010a41a8 URL:https://www.facebook.com/redbull>
>> uri.scheme 
#=> "https"
>> uri.host 
#=> "www.facebook.com"
>> uri.path 
#=> "/redbull"

Maybe validating the individual parts is easier than one big regex.

Upvotes: 1

Ant
Ant

Reputation: 3887

This will match only the 4 variants you suggested, plus http://facebook.com/redbull and https://facebook.com/redbull as these may also be common variants.

/\A((http|https):\/\/)?(www\.)?facebook\.com\/(\w*)?/i

Upvotes: 1

thecodeparadox
thecodeparadox

Reputation: 87073

Without RegEx you can use it:

var your_url = ''; //here, you place your URL

console.log(your_url.slice(your_url.lastIndexOf('/') + 1));

This will give desired output.

Upvotes: 0

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