Contents of a Unicode (UTF-8) text file named DriedMangos.txt:

Perl script to demonstrate matching Unicode grapheme clusters using the regular expression backslash sequence \X:

#!perl

use strict;
use warnings;
use autodie;

open my $input_fh,  '<:encoding(UTF-8)', 'DriedMangos.txt';
open my $output_fh, '>:encoding(UTF-8)', 'Graphemes.txt';

while (my $line = <$input_fh>) {
    chomp $line;

    while ($line =~ m/(\X)/g) {
        print $output_fh "[$1]";
    }

    print $output_fh "\n";
}

close $input_fh;
close $output_fh;
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Contents of the output text file named Graphemes.txt:

(See http://ameblo.jp/gucciman-ikkob/entry-10317490092.html for an explanation of the peculiar last line of the file named DriedMangos.txt.)

(See http://ameblo.jp/gucciman-ikkob/entry-10317490092.html for an explanation of the peculiar last line of the file named DriedMangos.txt.)

Presumably, it says that plain double-quotes were used instead of a combining mark. As such, q{ コ" } is really two graphemes even though it approximates one (q{ ゴ }).

Perl script to display the contents of the UTF-8 text file named DriedMangos.txt as a list of Unicode code points and character names:

#!perl

use strict;
use warnings;
use autodie;

use Unicode::UCD qw( charinfo );

open my $input_fh, '<:encoding(UTF-8)', 'DriedMangos.txt';

while (my $line = <$input_fh>) {
    chomp $line;

    while ($line =~ m/(.)/g) {
        my $character = $1;
        my $codepoint = ord $character;
        my $charinfo  = charinfo($codepoint);

        my $code = "U+$charinfo->{'code'}";
        my $name = $charinfo->{'name'};

        print "$code $name\n";
    }

    print "\n";
}

close $input_fh;
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The output of the script:

U+0064 LATIN SMALL LETTER D
U+0072 LATIN SMALL LETTER R
U+0069 LATIN SMALL LETTER I
U+0065 LATIN SMALL LETTER E
U+0064 LATIN SMALL LETTER D
U+0020 SPACE
U+006D LATIN SMALL LETTER M
U+0061 LATIN SMALL LETTER A
U+006E LATIN SMALL LETTER N
U+0067 LATIN SMALL LETTER G
U+006F LATIN SMALL LETTER O
U+0073 LATIN SMALL LETTER S

U+006D LATIN SMALL LETTER M
U+0061 LATIN SMALL LETTER A
U+006E LATIN SMALL LETTER N
U+0067 LATIN SMALL LETTER G
U+0075 LATIN SMALL LETTER U
U+0065 LATIN SMALL LETTER E
U+0073 LATIN SMALL LETTER S
U+0020 SPACE
U+0073 LATIN SMALL LETTER S
U+0065 LATIN SMALL LETTER E
U+0301 COMBINING ACUTE ACCENT
U+0063 LATIN SMALL LETTER C
U+0068 LATIN SMALL LETTER H
U+0065 LATIN SMALL LETTER E
U+0301 COMBINING ACUTE ACCENT
U+0065 LATIN SMALL LETTER E
U+0073 LATIN SMALL LETTER S

U+8292 CJK UNIFIED IDEOGRAPH-8292
U+679C CJK UNIFIED IDEOGRAPH-679C
U+5E79 CJK UNIFIED IDEOGRAPH-5E79

U+0064 LATIN SMALL LETTER D
U+006F LATIN SMALL LETTER O
U+0072 LATIN SMALL LETTER R
U+0061 LATIN SMALL LETTER A
U+0069 LATIN SMALL LETTER I
U+0064 LATIN SMALL LETTER D
U+006F LATIN SMALL LETTER O
U+0020 SPACE
U+006D LATIN SMALL LETTER M
U+0061 LATIN SMALL LETTER A
U+006E LATIN SMALL LETTER N
U+0067 LATIN SMALL LETTER G
U+006F LATIN SMALL LETTER O
U+0304 COMBINING MACRON
U+0073 LATIN SMALL LETTER S
U+0075 LATIN SMALL LETTER U

U+30C9 KATAKANA LETTER DO
U+30E9 KATAKANA LETTER RA
U+30A4 KATAKANA LETTER I
U+30C9 KATAKANA LETTER DO
U+30DE KATAKANA LETTER MA
U+30F3 KATAKANA LETTER N
U+30B4 KATAKANA LETTER GO
U+30B9 KATAKANA LETTER SU

U+30C8 KATAKANA LETTER TO
U+3099 COMBINING KATAKANA-HIRAGANA VOICED SOUND MARK
U+30E9 KATAKANA LETTER RA
U+30A4 KATAKANA LETTER I
U+30C8 KATAKANA LETTER TO
U+3099 COMBINING KATAKANA-HIRAGANA VOICED SOUND MARK
U+30DE KATAKANA LETTER MA
U+30F3 KATAKANA LETTER N
U+30B3 KATAKANA LETTER KO
U+3099 COMBINING KATAKANA-HIRAGANA VOICED SOUND MARK
U+30B9 KATAKANA LETTER SU

U+30C8 KATAKANA LETTER TO
U+0022 QUOTATION MARK
U+30E9 KATAKANA LETTER RA
U+30A4 KATAKANA LETTER I
U+30C8 KATAKANA LETTER TO
U+0022 QUOTATION MARK
U+30DE KATAKANA LETTER MA
U+30F3 KATAKANA LETTER N
U+30B3 KATAKANA LETTER KO
U+0022 QUOTATION MARK
U+30B9 KATAKANA LETTER SU
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The Latin characters with diacritics are in Unicode Normalization Form D (NFD). The katakana characters on the fifth line are in Unicode Normalization Form C (NFC). The same katakana characters on the sixth line are in NFD.