In search of the perfect URL validation regex

Re:In search of the perfect URL validation regex by mdavidn on Sunday June 22, 2014 @07:04PM (#7929518)

Use a standard URI parser to break this problem into smaller parts. Let a modern URI library worry about arcane details like spaces, fragments, userinfo, IPv6 hosts, etc.

   uri = URI.parse(target).normalize
   uri.absolute? or raise 'URI not absolute'
   %w[ http https ftp ].include?(uri.scheme) or raise 'Unsupported URI scheme'
   # Etc

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Re:In search of the perfect URL validation regex by mathias on Monday June 23, 2014 @03:01AM (#7930595)

That was not an option in this case, as the goal is to validate URLs entered as user input and blacklist certain URL constructs even though they’re technically valid.

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Re:In search of the perfect URL validation regex by mdavidn on Monday June 23, 2014 @11:29AM (#7932453)

So check if uri.host matches your blacklist.

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Re:In search of the perfect URL validation regex by droope on Sunday June 22, 2014 @08:00PM (#7929612)

It'd be interesting to look at URI.parse's source code.

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Re:In search of the perfect URL validation regex by mdavidn on Monday June 23, 2014 @11:33AM (#7932479)

It does match a regular expression internally.

https://github.com/ruby/ruby/blob/trunk/lib/uri/rfc2396_pars...

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