Feature #9846
Updated by nobu (Nobuyoshi Nakada) over 7 years ago
There should be `Regexp#to_regexp`, Regexp#to_regexp, just as there is `Array#to_ary` Array#to_ary and `String#to_str`. ```ruby String#to_str. p [].to_ary # => [] p ''.to_str # => "" p //.to_regexp # undefined method `to_regexp`... ``` The use case is code like this: ```ruby if o.respond_to?(:to_ary) # do something with o.to_ary elsif o.respond_to?(:to_str) # do something with o.to_str elsif elseif o.respond_to?(to_regexp) # can't do this today # do something with o.to_regexp ``` The workaround is to use `Regexp.try_convert`. Regexp.try_convert. `Regexp.try_convert` Regexp.try_convert accepts either a `Regexp` Regexp or an object that responds to `#to_regexp`; #to_regexp; so this code works fine (and is in some ways better): ```ruby elsif re = Regexp.try_convert(o) # do something with o ``` Still, that `Regexp` Regexp does not respond to `#to_regexp` #to_regexp surprised me. Does it surprise anyone else?