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Re: [perlre] $_ = /$re/ vs $_ =~ /$re/

by MarkM (Curate)
on Aug 28, 2003 at 23:49 UTC ( #287555=note: print w/replies, xml ) Need Help??

in reply to [perlre] $_ = /$re/ vs $_ =~ /$re/

Note that "$_ = /$re/" is actually equivalent to "$_ = ($_ =~ /$re/)". The final result that I would expect, is for ($_ =~ /$re/) to be interpretted in scalar context, resulting in a boolean value (1 or ""), and for the boolean value to be assigned to $_, which will alter the elements in @$dir to each be either 1 or "", depending on whether the element matched the regular expression or not.

Since you don't seem to be using @$dir again, this may have gone unnoticed. Since both expression invoke '$_ =~ /$re/', they do indeed 'do the same thing'.

If you are trying to reduce characters, try just "/$re/" without any mention of $_. As others recommended, you should really use "if (/$re/) {", as the match may not succeed.

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[marto]: the ticketing system does not accept calls via email, nor has it a working API. It's tied into Active Directory for authentication and the Solaris boxes aren't on that domain
[Corion]: The one thing I haven't figured out a solution to is how to get an edge-trigger instead of sending an email every 5 minutes if the usage is above 90%. I want one mail when it goes over 90% but no more emails as long as it stays between 90% and 95%.
[Corion]: marto: Clever! ;)
[Corion]: You can only reach me by pager
[Corion]: Maybe the solution would be to launch a cron job every minute that takes two measurements a minute apart and sends a mail if the usage is below on the first and above threshold on the last measurement
[marto]: that's essentially it :)
[marto]: I think the long term solution would be to have sysadmins that do their job, so I don't have to do everything :P
[marto]: they already have an entire BMC patrol system, which they disabled, because it was sending out spurious messages. So rather than fix the issue, or even find out what it was, they turned it off. No messages, can't be any problems, right?
[Corion]: marto: But having open tickets / incidents increases the pressure on them ;) Of course, likely your contract / SLA specifies an upper limit for the number of incidents :-D
[Corion]: marto: Ow ...

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