[ruby-core:116786] [Ruby master Feature#20266] New syntax to escape embed strings in Regexp literal

Issue #20266 has been updated by shan (Shannon Skipper).


I wonder if `#{^foo}` might be a passable alternative for `#{=foo}` since "pinning" *almost* makes sense and and uptick is less likely to actually be intended than an equals sign to start a quoted interpolation?

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Feature #20266: New syntax to escape embed strings in Regexp literal
https://bugs.ruby-lang.org/issues/20266#change-106810

* Author: usa (Usaku NAKAMURA)
* Status: Open
* Priority: Normal
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# Premise

When using embed strings in Regexp literal, it is interpreted as a part of the Regexp.

```ruby
foo = "[a-z]"
p /#{foo}/ #=> /[a-z]/
```

So, currently we often have to escape the embed strings.

```ruby
foo = "[a-z]"
p /#{Regexp.quote(foo)}/ #=> /\[a\-z\]/
```

This is very long and painful to write every time.
So, I propose new syntax to escape embed strings automatically.

# Proposal

Adding new token `#{=` in Regexp literal:

```ruby
foo = "[a-z]"
p /#{=foo}/ #=> /\[a\-z\]/
```

When `#{=` is used instead of `#{`, ruby calls `Regexp.quote` internally.

# Compatibility

Current ruby causes syntax error when using `#{=`, then there is no incompatibilty.

# Out of scope of this proposal

I do not propose about `#{=` in another literals.  They are out of scope of this proposal.



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