Luke Lonergan wrote:
> Bruce,
> > I found that parentheses in gawk regular expressions require backslashes
> > so they are not treated as regex groupings:
> >
> > $ echo '('|awk '$0 ~ /(/ {print $0}'
> > awk: cmd. line:1: fatal: Unmatched ( or \(: /(/
> > $ echo '('|awk '$0 ~ /\(/ {print $0}'
> > (
>
>
> > Now, it seems closing parentheses are OK because there is no open group,
> > but I think I should use backslashes there too:
> >
> > $ echo ')'|awk '$0 ~ /)/ {print $0}'
> > )
> > $ echo ')'|awk '$0 ~ /\)/ {print $0}'
> >
> > Does your awk produce different results? What version is it? Mine is GNU Awk
> > 3.0.6.
>
> Yes - on the last test, mine emits the ")" and yours apparently does not.
> The version I ran with is 3.1.4.
Actually, mine returns ')' too for the last command. I didn't copy
that into the email. How about the top tests? Notice I get an error on
the first one without the backslash. Are you OK escaping '(' but not
')'? That might be a solution.
> The escaped parenthesis in the unpatched pgindent causes the following
> warning:
>
> $ pgindent test.c
> Hope you installed /src/tools/pgindent/indent.bsd.patch.
> awk: cmd. line:12: warning: escape sequence `\)' treated as plain `)'
>
> Which implies an unnecessary escaping, which appears to function correctly
> without the escape.
>
> Cheers,
>
> - Luke
>
>
--
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