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

Re: my $1

by grinder (Bishop)
on Apr 23, 2009 at 20:33 UTC ( #759655=note: print w/ replies, xml ) Need Help??


in reply to my $1

$1 and $2 are package variables, not lexicals. You can nest their contents with local. Lexical $_ is a new addition from 5.10.0 onwards.

Best practice is simply to copy out $1 and ilk to lexicals, the way you're doing it (but within a conditional, checking that the match succeeded).

• another intruder with the mooring in the heart of the Perl


Comment on Re: my $1
Replies are listed 'Best First'.
Re^2: my $1
by mltucker (Initiate) on Apr 23, 2009 at 21:26 UTC

    Thanks for the reply.

    Ok, so could I use local for $1 and $2 in the same way that I use my for $_? This isn't working how I expected it to.

    I'm not sure if this is relevant, but the one that I'm having trouble with is the multiplication, where I use both the originals and the recursive call results:

    return "($1)*(".diff($2).")+($2)*(".diff($1).") if m/(.+?)\*(.+)/;

    This works fine using $capt1 = $1, but I'm curious as to whether it can be done using local or with the double quotes...

    -Mark

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://759655]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others lurking in the Monastery: (8)
As of 2015-07-31 01:19 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 (274 votes), past polls