Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number
 
PerlMonks  

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.


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

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://287555]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (6)
As of 2015-07-28 03:58 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (252 votes), past polls