Does not search Chinese, Japanese characters

• I have searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
• This isn't a feature request or a discussion topic

Bug description

The new signal search feature does not search Asian Characters. It only search sentence.

Steps to reproduce

• Have some complete sentences made of Asian Characters.
• search for individual character
• search returns no result.

Actual result:

• search for the whole sentence
• search return matching result.
• search return no result for characters or combination of characters

Expected result:
Search should return result for any combination of asian characters. If user searches "word1 word2" in asian characters, it is better to match any conversation where both word1 and word2 appears.

Device info

I beleieve this issue is general for all signal apps because it is built to search only roman words determined by spaces, periods, commas, etc.

Link to debug log

NA, since it is inherent limitation of the search feature implementation.

Start by reproducing the search behavior with individual and combined Chinese or Japanese characters, then trace the existing search feature's tokenization and matching entry point. Done means searches for individual characters and combinations return conversations containing them, while the existing whole-sentence search continues to work.