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From: | Paul Eggert |
Subject: | bug#33249: [PATCH] grep: grouping of patterns including back reference |
Date: | Sat, 3 Nov 2018 08:29:39 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 |
Norihiro Tanaka wrote:
By this change, each fragment is divided into groups by whether the fragment includes back reference in a pattern or not. a frgment which includes back reference constitutes group, and all frgments which include back reference also constitute a group.
Surely this is not sufficient. An invocation of grep like this: grep -E '(a b)'should be an error, but with the proposed patch won't it be equivalent to "grep -E '(a|b)'" since the pattern has no back-references?
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