[libreoffice-users] "reverse solidus" not working in the find dialog box

Good afternoon from Japan
Actually, I have asked about this in 2018 and a number of things were 
suggested.
Unfortunately none did solve the problem.
Problem:
I have a long file with about 3,500 lines (each line = item) looking like:
HKES    良知良能 [りょうちりょうのう] /(n) xxxxxx/

where I would like to replace the "space[" and "]space" with tabs
so that I can import the file into Calc.

However, working with Japanese Windows 10, Japanese keyboard etc. 
NOTHING I tried so far
allowed me to enter a \t (=> THIS is supposed to be a backslash) as a 
regular expression, telling
the computer to replace the space[ with a tab.

Question:
Is there a trick telling the computer to replace any key sequence with a 
tab?

Thank you.


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