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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)$/;


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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

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