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Unicode Programming in Modern Perl Nick Patch @nickpatch Shutterstock

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Perl has some of the best Unicode support today, especially with respect to regular expressions. Benjamin Peterson The Guts of Unicode in Python PyCon 2013

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UTF-8 encoded input

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UTF-8 encoded input ⇩ decode

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UTF-8 encoded input ⇩ decode ⇩ character string

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UTF-8 encoded input ⇩ decode ⇩ character string ⇩ hack… hack… hack…

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UTF-8 encoded input ⇩ decode ⇩ character string ⇩ hack… hack… hack… ⇩ encode

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UTF-8 encoded input ⇩ decode ⇩ character string ⇩ hack… hack… hack… ⇩ encode ⇩ UTF-8 encoded output

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use utf8;

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use utf8; $word =~ s{ (?: نیرت | يدنب | یدنب | هراب | دابأ | ییاه | يزاس | یزاس | يزیر | یزیر ) $}{}x;

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use utf8; $word =~ s{ (?: نیرت | يدنب | یدنب | هراب | دابأ | ییاه | يزاس | یزاس | يزیر | یزیر ) $}{}x;

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use utf8; $word =~ s{ (?: دابأ | هراب | یدنب | يدنب | نیرت | یزیر | يزیر | یزاس | يزاس | ییاه ) $}{}x;

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use utf8; $word =~ s{ (?: ия # definite articles for nouns: | ът # masculine ∙ | та # feminine ∙ | то # neutral ∙ | те # plural ∙ ) $}{}x;

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=encoding UTF-8

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=encoding UTF-8 =head1 NAME Lingua::Stem::UniNE - University of Neuchâtel stemmers

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=encoding UTF-8 =head1 NAME Lingua::Stem::UniNE - University of Neuchâtel stemmers

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=encoding UTF-8 =head1 NAME Lingua::Stem::UniNE - University of Neuchâtel stemmers

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use open qw( :encoding(UTF-8) :std );

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use open qw( :encoding(UTF-8) :std );

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use open qw( :encoding(UTF-8) :std );

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use utf8; use open qw( :encoding(UTF-8) :std ); use Test::More tests => 66; use Lingua::Stem::UniNE::CS qw( stem ); is stem('zvířatech'), 'zvíř', 'rm -atech'; is stem('zvířatům'), 'zvíř', 'rm -atům'; is stem('zvířata'), 'zvíř', 'rm -ata'; is stem('zvířaty'), 'zvíř', 'rm -aty';

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use utf8; use open qw( :encoding(UTF-8) :std ); use Test::More tests => 66; use Lingua::Stem::UniNE::CS qw( stem ); is stem('zvířatech'), 'zvíř', 'rm -atech'; is stem('zvířatům'), 'zvíř', 'rm -atům'; is stem('zvířata'), 'zvíř', 'rm -ata'; is stem('zvířaty'), 'zvíř', 'rm -aty';

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use utf8; use open qw( :encoding(UTF-8) :std ); use Test::More tests => 66; use Lingua::Stem::UniNE::CS qw( stem ); is stem('zvířatech'), 'zvíř', 'rm -atech'; is stem('zvířatům'), 'zvíř', 'rm -atům'; is stem('zvířata'), 'zvíř', 'rm -ata'; is stem('zvířaty'), 'zvíř', 'rm -aty';

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use utf8; use open qw( :encoding(UTF-8) :std ); use Test::More tests => 66; use Lingua::Stem::UniNE::CS qw( stem ); is stem('zvířatech'), 'zvíř', 'rm -atech'; is stem('zvířatům'), 'zvíř', 'rm -atům'; is stem('zvířata'), 'zvíř', 'rm -ata'; is stem('zvířaty'), 'zvíř', 'rm -aty';

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use charnames ':full';

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sub remove_kasra { my ($word) = @_; $word =~ s{ \x{0650} $}{}x; return $word; }

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sub remove_kasra { my ($word) = @_; $word =~ s{ \x{0650} $}{}x; return $word; }

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use charnames ':full'; sub remove_kasra { my ($word) = @_; $word =~ s{ \x{0650} $}{}x; return $word; }

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use charnames ':full'; sub remove_kasra { my ($word) = @_; $word =~ s{ \N{ARABIC KASRA} $}{}x; return $word; }

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use v5.16; sub remove_kasra { my ($word) = @_; $word =~ s{ \N{ARABIC KASRA} $}{}x; return $word; }

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lc('Größe') eq 'größe'

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lc('Größe') eq 'größe' uc('Größe') eq 'GRÖSSE'

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lc('Größe') eq 'größe' uc('Größe') eq 'GRÖSSE' lc('Größe') ne lc(uc('Größe'))

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lc('Größe') eq 'größe' uc('Größe') eq 'GRÖSSE' lc('Größe') ne lc(uc('Größe')) fc('Größe') eq fc('GRÖSSE')

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use Unicode::CaseFold; fc('Größe') eq fc('GRÖSSE')

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use v5.16; fc('Größe') eq fc('GRÖSSE')

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use Unicode::Normalize; NFC('Größe') eq NFC('Gro\x{0308}ße')

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use v5.16; use Unicode::Normalize; NFC(fc('Größe')) eq NFC(fc('GRO\x{0308}SSE'))

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use Unicode::Collate; my $c = Unicode::Collate->new; @countries = $c->sort(@countries);

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use Unicode::Collate; my $c = Unicode::Collate->new( level => 2 # ignore case ); $c->eq('Größe', 'GRO\x{0308}SSE')

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use Unicode::Collate; my $c = Unicode::Collate->new( level => 2 # ignore case ); $c->eq('Größe', 'GRO\x{0308}SSE')

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use Unicode::Collate::Locale; my $c = Unicode::Collate::Locale->new( locale => 'de' ); @words_de = $c->sort(@words_de);

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use Unicode::Collate::Locale; my $c = Unicode::Collate::Locale->new( locale => 'de' ); @words_de = $c->sort(@words_de);

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\d 123… … ১২৩ … ໑໒໓

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\d 123… … ১২৩ … ໑໒໓

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\d 123… … ১২৩ … ໑໒໓

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\d 123… … ১২৩ … ໑໒໓

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[0-9] 123…

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\w abc… 123… _ αβγ… ㄅㄆㄇ… …ج ب أ 

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\w abc… 123… _ αβγ… ㄅㄆㄇ… …ج ب أ 

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\w abc… 123… _ αβγ… ㄅㄆㄇ… …ج ب أ 

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\w abc… 123… _ αβγ… ㄅㄆㄇ… …ج ب أ 

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\b abc… 123… _ αβγ… ㄅㄆㄇ… …ج ب أ 

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/\w/a abc… 123… _

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\s

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\R LF (\n) CR (\r) FF (\f) CRLF (\r\n) NEL VT LS PS

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\R LF (\n) CR (\r) FF (\f) CRLF (\r\n) NEL VT LS PS

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\R LF (\n) CR (\r) FF (\f) CRLF (\r\n) NEL VT LS PS

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\R LF (\n) CR (\r) FF (\f) CRLF (\r\n) NEL VT LS PS

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.

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\X Spınal Tap ̈ n\N{COMBINING DIAERESIS} 각 กำำ நி िष CRLF (\r\n)

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\X Spın̈al Tap n\N{COMBINING DIAERESIS} 각 กำำ நி िष CRLF (\r\n)

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\X Spınal Tap ̈ n\N{COMBINING DIAERESIS} 각 กำำ நி िष CRLF (\r\n)

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\X Spınal Tap ̈ n\N{COMBINING DIAERESIS} 각 กำำ நி िष CRLF (\r\n)

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\X Spınal Tap ̈ n\N{COMBINING DIAERESIS} 각 กำำ நி िष CRLF (\r\n)

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\X Spınal Tap ̈ n\N{COMBINING DIAERESIS} 각 กำำ நி िष CRLF (\r\n)

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\p{…}

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\p{General_Category=Letter}

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\p{Letter}

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\p{L}

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\pL

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L Letter M Mark N Number P Punctuation S Symbol Z Separator C Other

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S Symbol Sm Math_Symbol Sc Currency_Symbol Sk Modifier_Symbol So Other_Symbol

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\p{Script=Latin}

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\p{Latin}

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[\p{Hiragana} \p{Katakana} \p{Han} \p{Latin} \p{Common}]

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[\p{Hira} \p{Kana} \p{Hani} \p{Latn} \p{Common}]

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Arab Arabic Beng Bengali Deva Devanagari Egyp Egyptian hieroglyphs Ethi Ethiopic Grek Greek Hang Hangul …

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return $word if $word =~ s{ $}{ }x зи г || $word =~ s{ ( е \p{Cyrl} ) $}{ $1}x и я || $word =~ s{ $}{ }x ци к || $word =~ s{ (?: | ) $}{}x; та ища

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\p{ASCII}

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\P{ASCII}

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use v5.18;

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(?[…])

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(?[ \d - \p{ASCII} ])

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(?[ \d & \p{Thai} ])

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no warnings 'experimental::regex_sets'; (?[ \d & \p{Thai} ])

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perlunicode — Unicode features perluniprops — Unicode properties perlre — regex syntax perlreref — regex reference perlrebackslash — regex escape sequences perlrecharclass — regex character classes Unicode::UCD — Unicode Character DB Lingua::Stem::UniNE — code examples

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Questions? Nick Patch @nickpatch Shutterstock