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Re: What type of regex is used by `tac` command?
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From: |
Pádraig Brady |
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Subject: |
Re: What type of regex is used by `tac` command? |
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Date: |
Wed, 27 Apr 2022 15:27:18 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:97.0) Gecko/20100101 Thunderbird/97.0 |
On 27/04/2022 09:33, Emily Seville wrote:
What type of regex is used by `tac` command? BRE/ERE or another flavour?
coreutils uses BRE throughout.
We should document this in the man pages and info docs.
I'll follow up with a patch to do that.
cheers,
Pádraig
For my reference...
$ git grep RE_SYNTAX
src/csplit.c: RE_SYNTAX_POSIX_BASIC & ~RE_CONTEXT_INVALID_DUP &
~RE_NO_EMPTY_RANGES;
src/expr.c: RE_SYNTAX_POSIX_BASIC & ~RE_CONTEXT_INVALID_DUP &
~RE_NO_EMPTY_RANGES;
src/nl.c: RE_SYNTAX_POSIX_BASIC & ~RE_CONTEXT_INVALID_DUP &
~RE_NO_EMPTY_RANGES;
We should explicitly set re_syntax_options in tac.c also for consistency.