GNU bug report logs - #78677
RegEx error

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Message #8 received at 78677 <at> debbugs.gnu.org (full text, mbox):

From: "Dale R. Worley" <Dale.Worley <at> comcast.net>
To: DANIL10RUS <danilleontevkek2akk <at> gmail.com>
Cc: 78677 <at> debbugs.gnu.org
Subject: Re: bug#78677: RegEx error
Date: Tue, 03 Jun 2025 22:51:44 -0400

DANIL10RUS <danilleontevkek2akk <at> gmail.com> writes:
>  danil <at> archlinux ~/minecraft_server> ls purpur-*.jar | grep -i "[^a-z\-\.]"
> purpur-2416.jar
> danil <at> archlinux ~/minecraft_server> ls purpur-*.jar | grep -i "[^a-z\.\-]"
> purpur-2416.jar

> Hello, encountered a RegEx error. For some reason grep doesn't recognize
> the “-” in \-\. but if we do \.\- it will work. Why is that?

Remember that within [...], backslash is not special but - is.  So in

   [^a-z\-\.]

The class specifies (1) the range from a to z, (2) the range from / to
/, (3) the character ..  Actually, it specifies the *complement* of that
set, so grep will give you any lines that contain a character that is
not in that set.

What is it you are trying to accomplish?

Dale

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