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Subject: Re: input foo, output '[F|f][O|o][O|o]'?
From: =?iso-8859-1?Q?Lawrence_Vel=E1zquez?= <larryv@macports.org>
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Date: Mon, 1 Jul 2013 21:30:22 -0400
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References: <694051372704284@web26e.yandex.ru> <E7CF18D5-CB4B-4E80-B7E0-40D5930E42DD@gmail.com>
To: TJ Luoma <luomat@gmail.com>
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On Jul 1, 2013, at 8:58 PM, TJ Luoma <luomat@gmail.com> wrote:

> On 1 Jul 2013, at 14:44, ZyX wrote:
>=20
>> By the way, what regex engine is your output for? Any I am aware of =
parse "[N|n]" as "either one of three characters: N, n, or pipe".
>=20
> Really? I can think of several that support it. Maybe it's because I'm =
old enough to remember when a lot of these utilities didn't have 'ignore =
case'
>=20
> % echo "foo\nbar\nbat" | egrep -v '[F|f]'
> bar
> bat
>=20
> % echo "foo\nbar\nbat" | sed 's#[F|f][O|o][O|o]#XXX#g'
> XXX
> bar
> bat

These regex are not matching what you think they are matching. For sure, =
"[F|f]" matches both lowercase and uppercase F, but as ZyX said, it also =
matches pipe characters:

    % echo "foo\nbar\nbaz\nbar|||baz" | egrep -v '[F|f]'
    bar
    baz

    % echo "foo\nbar\nbaz\nbar|||baz" | sed 's/[F|f][O|o][O|o]/XXX/g'
    XXX
    bar
    baz
    barXXXbaz

You are probably thinking of "(F|f)"; you should just use "[Ff]".

> You can also use it for matching case/esac :
>=20
> case "$i" in
> 	[C|c][R|r][A|a][S|s][H|h][P|p][L|l][A|a][N|n])
> 			echo "matched crashplan"
> 	;;
>=20
> 	*)
> 			echo "No Match"
> 	;;
>=20
> esac

Same misconception here; pipes in patterns' bracket expressions have no =
special meaning. You can remove all the pipes from your example, and it =
would still work.

    % case "crasHPLan" in
    case>           [Cc][Rr][Aa][Ss][Hh][Pp][Ll][Aa][Nn]) echo =
"matched";;
    case>           *) echo "did not match";;
    case> esac
    matched

vq=