Remove “www”, “http://” from string

Question

How can I remove \"www\", \"http://\", \"https://\" from strings using Ruby?

I tried this but it didn\'t work:

s.gsub(\'/(?:http?:\\/\\/)?(?:www\\.)?         


        

Answer 1

def strip_url(target_url)
  target_url.gsub("http://", "")
            .gsub("https://", "")
            .gsub("www.", "")
end

strip_url("http://www.google.com")
 => "google.com" 
strip_url("https://www.google.com")
 => "google.com" 
strip_url("http://google.com")
 => "google.com"
strip_url("https://google.com")
 => "google.com" 
strip_url("www.google.com")
 => "google.com" 

Answer 2

This method should catch all 3 variations:

def strip_url(url)
  url.sub!(/https\:\/\/www./, '') if url.include? "https://www."

  url.sub!(/http\:\/\/www./, '')  if url.include? "http://www."

  url.sub!(/www./, '')            if url.include? "www."

  return url
end

strip_url("http://www.google.com")
   => "google.com" 
strip_url("https://www.facebook.com")
   => "facebook.com" 
strip_url("www.stackoverflow.com")
  => "stackoverflow.com" 

Answer 3

s = s.sub(/^https?\:\/\//, '').sub(/^www./,'')

If you don't want to use s =, you should use sub!s instead of all subs.

The problems with your code are:

1. Question mark always follows AFTER an optional character
2. Always replace one pattern in a sub. You can "chain up" multiple operations.
3. Use sub instead of gsub and ^ in the beginning of Regexp so it only replaces the http:// in the beginning but leaves the ones in the middle.