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For example,
original text: 12.3
wanted text: 1.23

So I Ctrl+R, (click option:regular expressions)
Find input-box:(\d)\.
Replace input-box:\.\1

but the result is:1.13 not 1.23

Docs for regex
https://regex.sorokin.engineer/en/lates ... substitute
shows that you must use $1, not \1.

Thanks.
I don't know the symbol '$1' is used to denote the subexpression 1.
I used '\1' for that.

\1 is used in Regex (backreference). $1 is used in "replace with".