Change format or replace : with . for tag

[bluehealthblues]

I currently have lyrics tagged with format
[00:00:71]line 1
[00:07:23]line 2
[00:11:75]line 3..
I'm wondering if it could be changed to
[00:00.71]line 1
[00:07.23]line 2
[00:11.75]line 3..
I'm trying to replace the second ':' with '.'

Edit: Figured out using actions with regex
find
(\d{1,2}:\d{1,2}):(\d{1,3})
replace with
$1\.$2

[ohrenkino]

@bluehealthblues

replace with
$1\.$2

For purity of syntax' sake:
In the "replace with" part, the dot does not have to be escaped but is taken as literal. So
$1.$2
would be valid.

The solution could be:

@bluehealthblues

using actions with regex
find
(\d{1,2}:\d{1,2}):(\d{1,3})

replace with
$1.$2

(I repeat the generally feasible solution as the discourse forum software does not accept a solution in the first post of a topic