[ruby-core:114917] [Ruby master Feature#19904] Deprecate or warn on multiple regular expression encodings

Issue #19904 has been updated by nobu (Nobuyoshi Nakada).


```diff
diff --git a/parse.y b/parse.y
index 3b513d3ade8..278e7eff21b 100644
--- a/parse.y
+++ b/parse.y
@@ -8032,6 +8032,9 @@ regx_options(struct parser_params *p)
         else if (rb_char_to_option_kcode(c, &opt, &kc)) {
             if (kc >= 0) {
                 if (kc != rb_ascii8bit_encindex()) kcode = c;
+                if (kopt) {
+                    rb_warn0("multiple encoding options, ignored preceding");
+                }
                 kopt = opt;
             }
             else {
```

----------------------------------------
Feature #19904: Deprecate or warn on multiple regular expression encodings
https://bugs.ruby-lang.org/issues/19904#change-104785

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
----------------------------------------
It seems like you can pass multiple encoding flags to regular expression literals, but I think this should be a warning or possibly syntax error.

For example:

```ruby
x = /foo/nu

p x.encoding
```

`n` says the RE should be ASCII-8BIT, and `u` says it should be UTF-8.  The last flag wins, so in this case the regular expression gets UTF-8 encoding.  However, I think it should be a warning or even a syntax error if you specify multiple encoding options on a regular expression.  It seems like a mistake if programmers specify multiple.

Thanks!



-- 
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