Dear Perl Monks,

I hope you will see fit to guide me to the answer of how to match/compare unicode Greek characters by code points. New to Perl, I have searched the Perl documentation for quite a while, but to no avail.

I read a file with unicode Greek, divide it into words, and then inspect each character to see whether it is a vowel or not. (Later I will do much more...) What am I missing?

Thank you so very much.

All best wishes, Paticia Walters 

#!
# Read Greek file (WE_EX.txt) saved in UNICODE (UTF-8) format 
#        and divide it into words and then into individual characters;
#        then test to see whether the character is a vowel or not.
#        If yes, augment counter; if no, go to next character. 
#        Write the vowel to output file (WE_EX.out)
#
use strict;
use warnings;
use Encode;
use feature 'unicode_strings';
use utf8;
#
#
open my $IN, '<:encoding(UTF-8)', "WE_EX.txt"
    or die "Can't open file WE_EX.txt for reading: $!";
#
open my $OUT, ">WE_EX2.out"
    or die "Can't open file WE_EX2.out for writing: $!";
#
#
# SUBROUTINE: IS_VOWEL
#        This subroutine checks to see whether a unicode Greek 
#        character/code point is a vowel or not.
#        If it is, it returns the vowel. If not, it returns 0, FALSE.
#
sub is_vowel {
    utf8::encode($_[0]);                                  
    if ($_[0] =~ /\X{1F00-1FE3}/ ||   # Hex code points: ExtendedGreek
        $_[0] =~ /X{1FE6-1FFE}/ ||
        $_[0] =~ /X{0386-038F}/ ||   # Hex code points: GreekAndCoptic
        $_[0] =~ /X{0390}/ ||
        $_[0] =~ /X{0391}/ ||
        $_[0] =~ /X{0395}/ ||
        $_[0] =~ /X{0397}/ ||
        $_[0] =~ /X{0399}/ ||
        $_[0] =~ /X{039F}/ ||
        $_[0] =~ /X{03A5}/ ||
        $_[0] =~ /X{03A9}/ ||
        $_[0] =~ /X{03AA-03B1}/ ||
        $_[0] =~ /X{03B5}/ ||
        $_[0] =~ /X{03B7}/ ||
        $_[0] =~ /X{03B9}/ ||
        $_[0] =~ /X{03BF}/ ||
        $_[0] =~ /X{03C5}/ ||
        $_[0] =~ /X{03C9-03CE}/)     {        
        return $_[0];
    } else {
        return 0;
    }
}
#
#
# MAIN PROGRAM
#
my (@words, $char, $vowel);
while (<$IN>) {                         # Read Greek Unicode
    @words = split /[\W]/, ;              # Divide into words
    foreach (@words) {                           # For each word
        print $OUT (encode ('UTF-8', $_)) . "\n";  # Write output
        my $count = 0;                             # Count vowels
        my $end = length($_);                      # Get word length
        for (my $i = 0; $i < $end; $i++) {         # Inspect each char
            $char = substr($_, $i, 1);
            $vowel = &is_vowel($char);
            $count += 1 if ($vowel);
            print $OUT (encode ('UTF-8', $vowel)) . "\n"; # Write out
        }
        print $OUT "The number of vowels is: $count.\n";
    }
}
close $IN;
close $OUT;

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In reply to Comparing Unicode Greek Characters/Code Points by plwtoday

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