CODEWITHSUNDEEP
ruby-on-railsruby
Luca Romagnoli
Luca Romagnoli

Reputation: 12475

urls from gsub not correct

I have some problems when I try to check urls after I get them using the gsub method.

From the console it works fine:

('http://ale.it' =~ URI::regexp).nil?.to_s
=> "false"

but if i launch this it doesn't work:

"http://ale.it".gsub(/http[s]?:\/\/[^\s]+/, ('\0' =~ URI::regexp).nil?.to_s)   
=> "true"

How can I get correct urls?

Upvotes: 1

Views: 576

Answers (2)

Luca Romagnoli
Luca Romagnoli

Reputation: 12475

i solved with:

"http://ale.it".gsub(/http[s]?:\/\/[^\s]+/) do |m|
 (m =~ URI::regexp).nil?.to_s) 
end

Upvotes: 0

mikej
mikej

Reputation: 66293

This is an explanation of what your 2 examples do. Whilst it isn't really an answer it's a bit long to fit in a comment.

=~ returns the position where a match occurs or nil if no match is found.

In your first example 'http://ale.it' matches URI::regexp starting at position 0 so you get 0.nil? which is false, converted to a string "false"

gsub in your second example takes 2 parameters, a pattern and a replacement string and replaces all matches of the pattern with the replacement.

'\0' doesn't match URI::regexp so ('\0' =~ URI::regexp).nil? is true and with to_s applied is the string "true".

"http://ale.it" matches /http[s]?:\/\/[^\s]+/ so gets replaced with "true".

You will have to expand your question to explain what you're trying to achieve.

Upvotes: 3

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