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Re: How is regex implemented in gawk?
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From: |
arnold |
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Subject: |
Re: How is regex implemented in gawk? |
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Date: |
Sun, 23 May 2021 12:05:42 -0600 |
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User-agent: |
Heirloom mailx 12.5 7/5/10 |
Peng Yu <pengyu.ut@gmail.com> wrote:
> How is awk's regex implemented? Is there a way to reuse some
> implementation in REG_EXTENDED and only add some minimal code include
> these extra features? Or the implementation regex in gawk starts from
> scratch? Thanks.
Gawk uses the regex routines from GLIBC and GNULIB (which are identical).
If you need regex routines and are writing something that will only
be used on systems with GLIBC (= most of the major Linux distributions)
then you can just rely on the copy that's already in the C library.
Do 'man -s 3 regex' for more information.
Otherwise, you can copy the routines from GNULIB.
Arnold