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From: candycanearter07 <candycanearter07@candycanearter07.nomail.afraid>
Newsgroups: comp.editors
Subject: Re: Confused first time Kate user
Date: Tue, 2 Jul 2024 15:00:04 -0000 (UTC)
Organization: the-candyden-of-code
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Message-ID: <slrnv88573.3c14.candycanearter07@candydeb.host.invalid>
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Richard Owlett <rowlett@access.net> wrote at 14:40 this Tuesday (GMT):
> I have a Debian machine with Kate Version 16.08.3 .
>
> I wish to do a search & replace using regular expressions.
> The "Help" menu has led to
> https://docs.kde.org/stable5/en/kate/katepart/regular-expressions.html
> and
> https://docs.kde.org/stable5/en/kate/katepart/regex-patterns.html
>
> I have strings of the form "XYZn" where n is one to three digits 
> representing values of from 1 to 299. I wish to replace all occurrences 
> with "abc".
>
> The documents give essentially no examples.
>
> Help please.
> TIA


I'd recommend using an online regex generator like
https://regex101.com/.

This regex expression should do what you want:
[[:digit:]]{3}
-- 
user <candycane> is generated from /dev/urandom