Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

regular expressions using hash keys.

Posted on 2002-04-20
6
Medium Priority
?
195 Views
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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
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
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

 

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

Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Email validation in proper way is  very important validation required in any web pages. This code is self explainable except that Regular Expression which I used for pattern matching. I originally published as a thread on my website : http://www…
A year or so back I was asked to have a play with MongoDB; within half an hour I had downloaded (http://www.mongodb.org/downloads),  installed and started the daemon, and had a console window open. After an hour or two of playing at the command …
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Six Sigma Control Plans

610 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question