fix: match korean substring for suggestions

[woosuk288]

Related #257 but only Korean.

#257 has been same problem in Korean as well but no one has seemed to fix this yet for quite a long. so I tried this.

- Before

- After

I think ch2pattern function could help pattern match from other languages if people know their language's regex pattern.

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react-mentions	✅ Ready (Inspect)	Visit Preview	Aug 25, 2022 at 2:27PM (UTC)