[BUG]: Symbol "_" in search text is ignored

[liushuqi-2022]

Checked for duplicates?

• [X] This issue is not a duplicate

Does it also happen in the desktop version?

• [X] This bug does not occur in the latest version of Anki

What are the steps to reproduce this bug?

1. Open the Card brower page
2. Add the cards containing the special symbol "-"
3. Only search the "-"
4. The cards that do not contain this symbol will also be searched

Expected behaviour

Cards with corresponding symbols should be presented during search

Actual behaviour

Symbol "_" in search text is ignored, but the symbol "-" is working.

Debug info

AnkiDroid Version = 2.18.0 (464cf290cc77c3f2c562cb03b408b78a13be261b)

Backend Version = 0.1.38-anki24.04.1 (24.04.1 ccd9ca1a8309b80bcb50ddc5d99c7ce63440bce9)

Android Version = 8.1.0 (SDK 27)

ProductFlavor = full

Manufacturer = Google

Model = Android SDK built for x86

Hardware = ranchu

Webview User Agent = Mozilla/5.0 (Linux; Android 8.1.0; Android SDK built for x86 Build/OSM1.180201.037; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36

ACRA UUID = aca1a327-477a-43a2-9e70-18a001fd3e0b

FSRS Enabled = false

Crash Reports Enabled = true

(Optional) Anything else you want to share?

No response

Research

• [X] I am reporting a bug specific to AnkiDroid (Android app)
• [X] I have checked the manual and the FAQ and could not find a solution to my issue
• [ ] (Optional) I have confirmed the issue is not resolved in the latest alpha release (instructions)