[ruby-core:85388] [Ruby trunk Feature#14443] Omit 'pattern' parameter in '(g)sub(!)' when 'hash' is given

Issue #14443 has been updated by shyouhei (Shyouhei Urabe).


I remember this was rejected.

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Feature #14443: Omit 'pattern' parameter in '(g)sub(!)' when 'hash' is given
https://bugs.ruby-lang.org/issues/14443#change-70169

* Author: sawa (Tsuyoshi Sawada)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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When `(g)sub(!)` takes a hash as the second argument, in almost all use cases, the first argument expresses the union of keys of the hash. In the following, `/[abc]/` is the union of the keys `"a"`, `"b"`, `"c"`.

```ruby
"blahblah".sub(/[abc]/, {"a" => "A", "b" => "B", "c" => "C"})
```

I feel this redundant and not efficient. Hence I propose to let the current first argument be optional when a hash is given. The following:


```ruby
"blahblah".sub("a" => "A", "b" => "B", "c" => "C")
```

should be equivalent to:


```ruby
"blahblah".sub(pattern, {"a" => "A", "b" => "B", "c" => "C"})
```

where:

```ruby
pattern = Regexp.union(*{"a" => "A", "b" => "B", "c" => "C"}.keys.map{|k| Regexp.escape(k)})
```



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