Crashes while generating excerpts for ja, zh, ko locales

[eshurakov]

There is an issue on Sentry, but unfortunately couldn't reproduce it myself. So far it happens for users whose device locale is set to ja, zh or ko.

SIMPLENOTE-IOS-9RV

[rezzap]

We have a user who has reported the following characters in search cause a crash:

There are three types of characters mixed in my notes, English, Italian, Japanese.
I am trying to search the notes using English and Italian characters then the app crashes.
I cannot type more than two characters because it crashes immediately when I type only one character.

Regarding the app crash, the characters that crash are followings.

• Almost every small alphabet from "a" to "z" except "x"
• Special small alphabets ; "à", "ì", "è", "é", etc.
• Almost every big alphabet from "A" to "Z" except "X"
• Almost every numbers from "0" to "1" except "5"

Device Info:

iPhone11
iOS 13.5.1
simplenotes for iOS ver. 4.29

iPhone7
iOS14.1
simplenotes for iOS ver. 4.29

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