[ruby-core:106065] [Ruby master Bug#18294] error when parsing regexp comment

Issue #18294 has been updated by duerst (Martin D端rst).


thyresias (Thierry Lambert) wrote:
> The following code generates the error "too short escaped multibyte character"
> ``` ruby
> _re = /
>   foo  # \M-ca
> /x
> ```
> Removing the \ or doubling it makes the error disappear.
> Since this is in comment text, I would expect to be able to type anything there: am I missing something?

I guess yes. It's somewhat counter-intuitive, but I guess the implementation is handling escapes while it reads the regexp up to the /x, and only then it knows that some parts of it are comments. It would be possible to change the implementation, but I don't know if it's worth it for such an edge case.

----------------------------------------
Bug #18294: error when parsing regexp comment
https://bugs.ruby-lang.org/issues/18294#change-94656

* Author: thyresias (Thierry Lambert)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [i386-mingw32]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
The following code generates the error "too short escaped multibyte character"
``` ruby
_re = /
  foo  # \M-ca
/x
```
Removing the \ or doubling it makes the error disappear.
Since this is in comment text, I would expect to be able to type anything there: am I missing something?



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