How to create regex that indexes time masking maintaining string length vol. III

bruncio — Thu, 31 Mar 2022 16:55:29 GMT

Hi all,
as in the previous posts I and II I'd like to anonymize names of cities and to keep the length of a string.
The nature of logs is quite complex. I'm sharing the part in question:

2022-03-31 15:23:11,210 INFO ...
- ... 381 lines omitted ...
F_AUSWEISENDE=12.02.2022
F_AUSWEISNUMMER=A2A2A2AAA
F_BEHOERDE=Berlin
F_BV_FREITEXTANTRAG= ---------------

What I'd like to get is:

2022-03-31 15:23:11,210 INFO ...
- ... 381 lines omitted ...
F_AUSWEISENDE=12.02.2022
F_AUSWEISNUMMER=A2A2A2AAA
F_BEHOERDE=XXXXXX
F_BV_FREITEXTANTRAG= ---------------

Sometimes, unfortunately, the names are more complex and include processing errors:

F_BEHOERDE=Stadt Rastatt B\xFCrgerb\xFCro
then I'd like to get:
F_BEHOERDE=XXXXX XXXXXXX XXXXXXXXXXXXXXXX

I've managed to create the regex which anonymizes city names but doesn't keep the length of them. If the dynamic version is not possible. Probably I will need to stick with this:

s/F_BEHOERDE=.*/F_BEHOERDE=XXXXX/g

I'll be grateful for any hints

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How to create regex that indexes time masking maintaining string length vol. III