} elsif( /^(\#?\s*(?:pickup|qmgr)\s+)(?:fifo|unix)(\s+.*)/ ) {
if( defined $normalize->{$1} ) { next; } else { $normalize->{$1} = 1;
}
if the string starting at the beginning of the line matches, $1 will
contain "zero or one #, zero or more whitespaces, either the word "pickup"
or "qmgr", one or more whitespace" - it's then being used as the kev value
in the hash referenced by $normalize - if that entry already has a true
value (probably a 1) don't do anything, otherwise, assign that key a 1 .
Note, to fully match, that string has to be followed by either "fifo" or
"unix" and 1 or more whitespaces. Everything (including those last
whitespaces) will end up $2.
I'm a tad puzzled as to what the purpose could be, there certainly are
easier ways to do this. The "use <something>" is including the module
<something>.pm in the code, so it's subs/methods etc can be used by the
program.
On Thu, Jun 15, 2023 at 2:29 PM Freek de Kruijf <f.de.kru...@gmail.com>
wrote:
> Hi,
>
> I am trying to understand fully a perl program with the following lines:
>
> } elsif( /^(\#?\s*(?:pickup|qmgr)\s+)(?:fifo|unix)(\s+.*)/ ) {
> if( defined $normalize->{$1} ) { next; } else { $normalize->{$1} =
> 1; }
> I do understand the first line, but I can not find what the second line is
> about.
>
> As far as can see the tested line in $_, from a file, is all ASCII with
> lower
> case characters. At the begin of the perl program the is no "use
> <something>".
>
> --
>
> fr.gr.
>
> Freek de Kruijf
>
>
>
>
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>
--
a
Andy Bach,
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