[ruby-core:95879] [Ruby master Feature#13083] Regexp#{match, match?} with a nil argument are deprecated and will raise a TypeError in Ruby 3.0

Issue #13083 has been updated by Eregon (Benoit Daloze).


knu (Akinori MUSHA) wrote:
> I'm a bit surprised and confused.  The change that has been made is not what this issue was originally about, and actually the opposite, I think.

Per matz's decision: https://bugs.ruby-lang.org/issues/13083#note-3
I renamed the issue in https://bugs.ruby-lang.org/issues/13083#note-16 to match the current change.
Now it's just a deprecation warning.

> I believe many of us have got used to the original behavior, that is, methods of a Regexp object work permissively and accept nil, and we know we've migrated many pieces of code from `/re/ =~ nilable` / `/re/ === nilable` to `/re/.match?(nilable)` for the sake of performance and readability just as shugo said above.
> 
> Can't we reconsider this?  Or we'll be doomed to back out all those changes we believed to improve performance.

`nilable&.match?(/re/)` would be an easy way to rewrite those cases, no?

@matz and others: what do you think, should we make `Regexp#{match,match?}` consistent and not accept `nil` or accept them as special-case to match the =~ and === operators?

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Feature #13083: Regexp#{match,match?} with a nil argument are deprecated and will raise a TypeError in Ruby 3.0
https://bugs.ruby-lang.org/issues/13083#change-82716

* Author: kachick (Kenichi Kamiya)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
----------------------------------------
Just for consistency

* patch: https://github.com/ruby/ruby/pull/1506
* spec: https://github.com/ruby/spec/pull/380

Currently behaves as ( ruby --version: ruby 2.5.0dev (2016-12-28 trunk 57228) [x86_64-darwin16] )

~~~ ruby
'string'.__send__(:=~, nil) #=> nil
'string'.match(nil)         #=> TypeError: wrong argument type nil (expected Regexp)
'string'.match?(nil)        #=> TypeError: wrong argument type nil (expected Regexp)
:symbol.__send__(:=~, nil)  #=> nil
:symbol.match(nil)          #=> TypeError: wrong argument type nil (expected Regexp)
:symbol.match?(nil)         #=> TypeError: wrong argument type nil (expected Regexp)
/regex/.__send__(:=~, nil)  #=> nil
/regex/.match(nil)          #=> nil
/regex/.match?(nil)         #=> false
~~~


Expected to

~~~ruby
'string'.__send__(:=~, nil) #=> nil
'string'.match(nil)         #=> nil
'string'.match?(nil)        #=> false
:symbol.__send__(:=~, nil)  #=> nil
:symbol.match(nil)          #=> nil
:symbol.match?(nil)         #=> false
/regex/.__send__(:=~, nil)  #=> nil
/regex/.match(nil)          #=> nil
/regex/.match?(nil)         #=> false
~~~



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