[ruby-core:101049] [Ruby master Bug#17340] /\p{/ matches newline instead of throwing syntax error

Issue #17340 has been updated by jirkamarsik (Jirka Marsik).


Great, thanks!

----------------------------------------
Bug #17340: /\p{/ matches newline instead of throwing syntax error
https://bugs.ruby-lang.org/issues/17340#change-88720

* Author: jirkamarsik (Jirka Marsik)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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The regular expression `/\p{/` matches newline characters instead of reporting a syntax error.

```
irb(main):001:0> /\p{/.match("\n")
=> #<MatchData "\n">
```

The issue stems from the function `fetch_char_property_to_ctype` in `regparse.c`. If the Unicode character property escape is not terminated with a right brace or some of the other unacceptable characters, the method will return 0 and will not be considered a failure. The number 0 is then interpreted as a `ctype` code which stands for the newline character property. Thus, this expression will end up matching newlines. I would guess that the intended behavior here would be to report a syntax error in the regular expression.



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