Set your "other options" in the find/replace box to enable regular
expressions

All Kanji characters, paste the following into search.

([一-龯]+)

All Hiragana or Katakana characters paste the following into search.

([ぁ-んァ-ン]+)

note this 2nd one has 2 unicode ranges... you can reduce this to search for
only one. But the site I copied these ranges from lists Hiragana and
Katakana together. I presume the first is Hiragana, but I've really no
clue.  If you're working with text, one of these might be familiar.

In the replace section, paste
$1

and while the cursor is active in the replace box, select format.

The site I copied the regex ranges from:
https://gist.github.com/terrancesnyder/1345094

About the brackets & parenthesis in REGEX searches:
https://stackoverflow.com/questions/9801630/what-is-the-difference-between-square-brackets-and-parentheses-in-a-regex


On Wed, Apr 14, 2021 at 9:07 PM Thomas Blasejewicz <ny...@hb.tp1.jp> wrote:

> Good morning.
> I have this not very long English text with occasional Japanese
> characters in it.
> I would like to search for ONLY the Japanese characters, naturally the
> font is different from the English but attribut "regular" and size are
> the same,
> and if possible change their attributes (color, highlighting etc.).
>
> Searching the net, I found:
>
> https://ask.libreoffice.org/en/question/140748/how-do-i-search-for-a-specific-font-in-writer/
> "The Find and Replace dialog (Control+H) should be able to search for
> text by font. Leave the "Find" box blank. Then go Other options > Format
> and fill in the "Family" box."
>
> However, that does NOT work.
> I tried to search for all sorts of things: format, attribute, language
> etc., but so far nothing helped finding Japanese characters.
>
> If anybody knows how to do that, I would be grateful for a hint.
> Thank you.
> Thomas
>
>
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