Re: [Rails] Need help on #grep

On Mon, May 13, 2013 at 7:19 AM, Love U Ruby <lists@ruby-forum.com> wrote:

ObjectSpace.each_object(Class).to_a.grep(/(stri)/i)

ObjectSpace.each_object(Class).select { |x| x.to_s =~ /stri/i }

 => [String, RubyToken::TkDXSTRING, RubyToken::TkDSTRING, RubyToken::TkXSTRING, RubyToken::TkSTRING]

(Hello from Ruby 2.0)

Other solutions give you the stringified class name. The above gives you the class object, in case you want to do something with it beside fettle its characters.

Nitpick: the () aren't necessary in that regex; they're only needed if you're capturing part of the output. E.g.,

ObjectSpace.each_object(Class).map { |x| x.to_s =~ /(.*)::.*stri/i and $1 }.compact.uniq

 => ["RubyToken"]

ObjectSpace.each_object(Class).to_a.map(&:to_s).grep(/(.*)::.*stri/i) { |_| $1 }.uniq

 => ["RubyToken"]

Paul

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