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Re^2: making a text file to an hash array

by changma_ha (Sexton)
on Jul 15, 2010 at 04:07 UTC ( #849692=note: print w/replies, xml ) Need Help??


in reply to Re: making a text file to an hash array
in thread making a text file to an hash array

Thanks so much for ur help....but suppos my text data is of hundreds of line...it is not always possible to make a hash array as u had made....them what can i do?
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Re^3: making a text file to an hash array
by johngg (Canon) on Jul 15, 2010 at 20:36 UTC

    You can use the same code because the \s* and \s+ in the match will also cater for newline (and carriage return if on Windows) so extracting the key and value parts will still work.

    $ perl -MData::Dumper -E ' > $text = <<EOT; > a 2 b 4,5,6 c d e 45,657,-67 > f g 23,54 h 5 i j > 286,71,90 k 7 l 72 > m 26,8 n > EOT > %hash = > map { $_->[ 0 ] => [ split m{,}, $_->[ 1 ] ] } > sub { > push @arr, [ $1, $2 ] > while $_[ 0 ] =~ m{\s*([a-z])\s+([-,\d]*)}g; > return @arr; > }->( $text ); > say Data::Dumper->Dumpxs( [ \ %hash ], [ qw{ *hash } ] );' %hash = ( 'e' => [ '45', '657', '-67' ], 'n' => [], 'a' => [ '2' ], 'm' => [ '26', '8' ], 'd' => [], 'j' => [ '286', '71', '90' ], 'l' => [ '72' ], 'c' => [], 'k' => [ '7' ], 'h' => [ '5' ], 'b' => [ '4', '5', '6' ], 'g' => [ '23', '54' ], 'f' => [], 'i' => [] ); $

    If your data is in a file then slurp the whole of the file into a scalar. Something like (using strictures and warnings):-

    my $dataFile = q{/path/to/myDataFile}; my $text = do { open my $dataFH, q{<}, $dataFile or die qq{open: < $dataFile: $!\n}; local $/; <$dataFH>; };

    I hope this answers your question.

    Cheers,

    JohnGG

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