in reply to find acronyms in a text

This should work for text files. 
#!/usr/bin/perl -w

use strict;

my %acronyms_captured;

my $file = 'test.txt';
open FH, "<", $file or die;

while(<FH>){
    my @words = $_ =~ m/\b[A-Z]+\b/g;
    foreach(@words) { $acronyms_captured{$_} = undef; }
}
close(FH);

foreach(keys(%acronyms_captured)){ print "$_\n"; }

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Re^2: find acronyms in a text
by davorg (Chancellor) on Jul 23, 2009 at 14:59 UTC
    my @words = $_ =~ m/\b[A-Z]+\b/g;

    Aren't you missing capturing brackets there?

    my @words = m/\b([A-Z]+)\b/g;

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    foreach(@words) { $acronyms_captured{$_} = undef; }

    Personally, I'd write that as:

    @acronyms_captured{@words} = ();

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    I like hash slices a lot :-)

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      well, i thought it didnt matter in this case either way as whatever is captured here is what i want ... but i guess adding capturing brackets to make it explicit is better practise.
      ... and also the same with using ( ) for undef
      am learning ... thanks
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Re^2: find acronyms in a text
by steph_bow (Pilgrim) on Jul 23, 2009 at 14:44 UTC

    Thanks a lot, but I don't understand the line 

    my @words = $_ =~ m/\b[A-Z]+\b/g;

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    You don't use split ?

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      Thanks a lot, but I don't understand the line  my @words = $_ =~ m/\b[A-Z]+\b/g;

      I used regular expressions here to capture all consecutively appearing upper case alphabets separated by word boundaries (\b). Please check the perl regular expressions documentation

      You don't use split ?

      You could use split if you like but i think it is better to split by \W+ (non-word character) rather than \s+. This helps keep pattern matching simple in the next step. For the sample text below, using \s+ instead of \W+ would find none unless we perform a more complicated pattern matching later.

      my %acronyms;

my $text= "An important class of transcription factors called general 
+transcription factors (GTF) are necessary for transcription to occur.
+ The Most common GTF's are TFIIA, TFIIB, and TFIIE.And a few more not
+ mentioned here.";

my @words = split('\W+', $text);

foreach(@words) {
       if($_ =~ m/^[A-Z]+$/){ $acronyms{$_}++; }
}
foreach( keys(%acronyms) ){ print "$_ seen $acronyms{$_} times\n"; }

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