Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Re^4: write and read the same file not display the output

by Kenosis (Priest)
on Sep 05, 2012 at 02:07 UTC ( #991722=note: print w/ replies, xml ) Need Help??


in reply to Re^3: write and read the same file not display the output
in thread write and read the same file not display the output

Good eye, Rudolf! Did you mean:

print $1 if /^($name)$/;


Comment on Re^4: write and read the same file not display the output
Download Code
Re^5: write and read the same file not display the output
by Rudolf (Monk) on Sep 05, 2012 at 03:08 UTC

    Hey thanks for the nice reply, but I was not aware of a difference in the regex with the parentheses (though I updated my post): It would be good if you can point it out for me, always up for learning more Perl ! :-)

    print $1 if /^$name$/; #or print $1 if /^($name)$/;

      $1 is initialized via regex captures which use parentheses. For example, in the following:

      my $string = 'Frank'; my $name = 'Frank'; print $1 if $string =~ /^$name$/; print $1 if $string =~ /^($name)$/;

      The first print statement produces:

      Use of uninitialized value $1 in...

      Whereas, the second print shows the value in $1:

      Frank

        ahh I see, thats valuable information I lost along the way haha thank you for taking the time to explain. Enjoy your week! -Rudolf

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://991722]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others scrutinizing the Monastery: (5)
As of 2015-07-05 14:28 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 (67 votes), past polls