GNU bug report logs - #21865
Parenthesis subexpressions

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Valerio Bozzolan <bozzolan.valerio <at> educ.di.unito.it>
To: bug-grep <at> gnu.org
Subject: Parenthesis subexpressions
Date: Sun, 08 Nov 2015 21:42:44 +0100

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Hi,

(First time in a GNU mailing list!)

I've already asked this question to my local GNU/Linux user group and in #grep <at> Freenode... I'm still confused.

GNU Grep don't have an arg to choose the subexpression. Right?

Stupid e.g.:
    echo abcde | grep -o -E 'b([a-z])d'
    => "bcd"

What if I want the first subexpression? ("b")? GNU Grep can't do it. Isn't it? (Why?)

I actually use GNU Awk, or GNU Bash with $BASH_REMATCH[$n_sub].

Thank you for the clarification!
--
Valerio Bozzolan
Email sent from Android (CyanogenMod) using K-9 Mail.

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