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regular expressions using hash keys.

Posted on 2002-04-20
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Last Modified: 2008-03-10
Hi all im really stuck with this one.
I have the following code:

-----
my(%sentence_hash, @pattern_list, $count);

my @text = ([this, is, a, summary], [however, this, is, another]);

# match values for regular expressions and their points
my %patterns = (
             "\bsummary\b", 10,
          "\bhowever\b", -5,
          "\bis\b", 3,
          "\bare\b", 3);
         

# had to do this --
#     @pattern_list = keys(%patterns);
# cut off the last two letters of each key.
foreach (keys(%patterns))
{
     push @pattern_list, $_
}

$count = 0;

foreach my $sentence (@text)
{
     foreach my $pat (@pattern_list)
     {
          if(@$sentence =~ /$pat/i)
          {
               # update score value in %sentence_hash. @score is now obsolete.
               $sentence_hash{$count} += $patterns{$pat};
          }
     }
     $count++
}
-----

the keys in %patterns need to be used as the match values in the regular expression.
the keys for %sentence_hash are the sentence numbers ($count) the values are the points assined to that sentence based on what patterns are included in the sentence.
for this example %sentence_hash should end up containing:
%sentence_hash = (
     '0' => 13,
     '1' => -2);
but it does not work.
the regular expression never matches.
please help
Andrew
0
Comment
Question by:arenwick
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6 Comments
 
LVL 84

Accepted Solution

by:
ozo earned 1200 total points
ID: 6957259
my(%sentence_hash, @pattern_list, $count);

my @text = ([this, is, a, summary], [however, this, is, another]);

# match values for regular expressions and their points
my %patterns = (
         "\\bsummary\\b", 10,
         "\\bhowever\\b", -5,
         "\\bis\\b", 3,
         "\\bare\\b", 3);


# had to do this --
#     @pattern_list = keys(%patterns);
# cut off the last two letters of each key.
@pattern_list = keys %patterns;

$count = 0;

foreach my $sentence ( @text ){
    foreach my $pat ( @pattern_list ){
         if( grep/$pat/i,@$sentence ){
              # update score value in %sentence_hash. @score is now obsolete.
              $sentence_hash{$count} += $patterns{$pat};
         }
    }
    $count++
}
0
 

Author Comment

by:arenwick
ID: 6957283
ozo,
that still does the same thing.
if i try:

-----
my(%sentence_hash, @pattern_list, $count);
my @text = ([this, is, a, summary], [however, this, is, another]);
# match values for regular expressions and their points
my %patterns = (
             "\bsummary\b", 10,
          "\bhowever\b", -5,
          "\bis\b", 3,
          "\bare\b", 3);
         

@pattern_list = keys %patterns;

foreach (@pattern_list)
{
     print "$_\n";
}

$count = 0;

foreach my $sentence(@text)
{
     foreach (@pattern_list)
     {
          print "$_ \n";
          if(grep/$_/i,@$sentence)
          {

               # update score value in %sentence_hash. @score is now obsolete.
               $sentence_hash{$count} += $patterns{$pat};
          }
     }
     $count++
}

-----

with the two print statements to see what is happening
the output is:
-----
is
are
summary
however
i
ar
summar
howeve
i
ar
summar
howeve
-----

so the first print works but the second does not.

thanks
andrew
0
 

Author Comment

by:arenwick
ID: 6957284
sorry

$sentence_hash{$count} += $patterns{$pat};

should have been:

$sentence_hash{$count} += $patterns{$_};
0
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Author Comment

by:arenwick
ID: 6957289
sorry

$sentence_hash{$count} += $patterns{$pat};

should have been:

$sentence_hash{$count} += $patterns{$_};
0
 
LVL 84

Expert Comment

by:ozo
ID: 6957291
# "\b" = "\cH"

my %patterns = (
         "\\bsummary\\b", 10,
         "\\bhowever\\b", -5,
         "\\bis\\b", 3,
         "\\bare\\b", 3
);
#or
my %patterns = (
         '\bsummary\b', 10,
         '\bhowever\b', -5,
         '\bis\b', 3,
         '\bare\b', 3
);

0
 

Author Comment

by:arenwick
ID: 6957303
cheers,
the "\\b... worked.
thanks for your help.
andrew
0

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