[Bug] Non-ASCII symbols not converted

[Kristinita]

1. Summary

Non-ASCII symbols not converted for me.

2. Expected behavior

1. Native Sublime Text Convert Case — Upper Case, Lower Case and so on — successfully work for me in Non-ASCII symbols.
2. Case Conversion worked for me for Latin letters.

3. Actual behavior

Case Conversion features don't worked for me for Cyrillic letters. I get stack trace.

command: convert_to_camel
Traceback (most recent call last):
  File "D:\Sublime Text 3 x64\sublime_plugin.py", line 818, in run_
    return self.run(edit)
  File "case_conversion in D:\Sublime Text 3 x64\Data\Installed Packages\Case Conversion.sublime-package", line 104, in run
  File "case_conversion in D:\Sublime Text 3 x64\Data\Installed Packages\Case Conversion.sublime-package", line 87, in run_on_selections
  File "case_conversion in D:\Sublime Text 3 x64\Data\Installed Packages\Case Conversion.sublime-package", line 31, in to_camel_case
IndexError: list index out of range

4. Steps to reproduce

The problem is reproduced for me in a version of Sublime Text without plugins and user settings.

I have any Cyrillic text, for example,

Кристина Беспрецедентна

I select text → Ctrl+Shift+P → ConvertCase: camelCase → I get actual behavior.

5. Environment

Operating system and version:
Windows 10 Enterprise LTSB 64-bit EN
Sublime Text:
Build 3126

Thanks.

[dlnsk]

OS: Linux

Convert Cyrillic to snake_case change selection to nothing.
https://stackoverflow.com/questions/36187349/python-regex-for-unicode-capitalized-words