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From: Richard Owlett <rowlett@access.net>
Newsgroups: comp.editors
Subject: CLARIFICATION [Re: Confused first time Kate user]
Date: Wed, 3 Jul 2024 05:57:39 -0500
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On 07/02/2024 09:40 AM, Richard Owlett wrote:
> 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
> 

The first paragraph of the first reference explicitly warns:
> This Appendix contains a brief but hopefully sufficient and
> covering introduction to the world of regular
> expressions. It documents regular expressions in the form
> available within KatePart, which is not compatible with the regular
> expressions of perl, nor with those of for example
> grep.

Please note the phrasing "... which is not compatible ...".
This is a personal project. I started searching the web for information 
on regular expressions. Circumstances require I use this particular 
machine with its current software ] no updates ;[

My formal background is limited to a single introductory programming 
course I took as a freshman E.E. student in '61. I learned by doing.

My web reading and a discussion in another forum has may has made me 
aware that there is more than one way to handle regular expressions.

This time I asked on a "editor" focused group and specified the specific 
editor I'm using.