[ruby-core:107955] [Ruby master Bug#18640] default empty string argument for `String#sub` and `String#sub!`, e.g. `"hello".sub("l")`

Issue #18640 has been reported by dorianmariefr (Dorian Mari辿).

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Bug #18640: default empty string argument for `String#sub` and `String#sub!`, e.g. `"hello".sub("l")`
https://bugs.ruby-lang.org/issues/18640

* Author: dorianmariefr (Dorian Mari辿)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-darwin21]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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Most of the time I replace a string with an empty string. And I think that's the main use case.

Also, `String#delete` deletes every character provided when passed a string.

```ruby
class String
  alias original_sub sub
  alias original_sub! sub!

  def sub(pattern, replacement = "", &block)
    original_sub(pattern, replacement, &block)
  end

  def sub!(pattern, replacement = "", &block)
    original_sub!(pattern, replacement, &block)
  end
end

puts "hello".sub("l")
puts "hello".sub!("l")
```

What do you think?



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