Zp Paragraph_Separator
C Other
- Cc Control (also Cntrl)
+ Cc Control (also Cntrl)
Cf Format
Cs Surrogate (not usable)
Co Private_Use
syllabaries (hiragana and katakana), you can define
sub InKana {
- return <<END;
+ return <<END;
3040\t309F
30A0\t30FF
END
You could also have used the existing block property names:
sub InKana {
- return <<'END';
+ return <<'END';
+utf8::InHiragana
+utf8::InKatakana
END
the non-characters:
sub InKana {
- return <<'END';
+ return <<'END';
+utf8::InHiragana
+utf8::InKatakana
-utf8::IsCn
The negation is useful for defining (surprise!) negated classes.
sub InNotKana {
- return <<'END';
+ return <<'END';
!utf8::InHiragana
-utf8::InKatakana
+utf8::IsCn
code point and the destination code point. For example:
sub ToUpper {
- return <<END;
+ return <<END;
0061\t\t0041
END
}
Level 1 - Basic Unicode Support
- RL1.1 Hex Notation - done [1]
- RL1.2 Properties - done [2][3]
- RL1.2a Compatibility Properties - done [4]
- RL1.3 Subtraction and Intersection - MISSING [5]
- RL1.4 Simple Word Boundaries - done [6]
- RL1.5 Simple Loose Matches - done [7]
- RL1.6 Line Boundaries - MISSING [8]
- RL1.7 Supplementary Code Points - done [9]
+ RL1.1 Hex Notation - done [1]
+ RL1.2 Properties - done [2][3]
+ RL1.2a Compatibility Properties - done [4]
+ RL1.3 Subtraction and Intersection - MISSING [5]
+ RL1.4 Simple Word Boundaries - done [6]
+ RL1.5 Simple Loose Matches - done [7]
+ RL1.6 Line Boundaries - MISSING [8]
+ RL1.7 Supplementary Code Points - done [9]
[1] \x{...}
[2] \p{...} \P{...}
- [3] supports not only minimal list, but all Unicode character
- properties (see L</Unicode Character Properties>)
+ [3] supports not only minimal list, but all Unicode character
+ properties (see L</Unicode Character Properties>)
[4] \d \D \s \S \w \W \X [:prop:] [:^prop:]
[5] can use regular expression look-ahead [a] or
- user-defined character properties [b] to emulate set operations
+ user-defined character properties [b] to emulate set
+ operations
[6] \b \B
- [7] note that Perl does Full case-folding in matching (but with bugs),
- not Simple: for example U+1F88 is equivalent to U+1F00 U+03B9,
- not with 1F80. This difference matters mainly for certain Greek
- capital letters with certain modifiers: the Full case-folding
- decomposes the letter, while the Simple case-folding would map
- it to a single character.
- [8] should do ^ and $ also on U+000B (\v in C), FF (\f), CR (\r),
- CRLF (\r\n), NEL (U+0085), LS (U+2028), and PS (U+2029);
- should also affect <>, $., and script line numbers;
- should not split lines within CRLF [c] (i.e. there is no empty
- line between \r and \n)
- [9] UTF-8/UTF-EBDDIC used in perl allows not only U+10000 to U+10FFFF
- but also beyond U+10FFFF [d]
+ [7] note that Perl does Full case-folding in matching (but with
+ bugs), not Simple: for example U+1F88 is equivalent to
+ U+1F00 U+03B9, not with 1F80. This difference matters
+ mainly for certain Greek capital letters with certain
+ modifiers: the Full case-folding decomposes the letter,
+ while the Simple case-folding would map it to a single
+ character.
+ [8] should do ^ and $ also on U+000B (\v in C), FF (\f), CR
+ (\r), CRLF (\r\n), NEL (U+0085), LS (U+2028), and PS
+ (U+2029); should also affect <>, $., and script line
+ numbers; should not split lines within CRLF [c] (i.e. there
+ is no empty line between \r and \n)
+ [9] UTF-8/UTF-EBDDIC used in perl allows not only U+10000 to
+ U+10FFFF but also beyond U+10FFFF [d]
[a] You can mimic class subtraction using lookahead.
For example, what UTS#18 might write as
[17] see UAX#10 "Unicode Collation Algorithms"
[18] have Unicode::Collate but not integrated to regexes
- [19] have (?<=x) and (?=x), but look-aheads or look-behinds should see
- outside of the target substring
- [20] need insensitive matching for linguistic features other than case;
- for example, hiragana to katakana, wide and narrow, simplified Han
- to traditional Han (see UTR#30 "Character Foldings")
+ [19] have (?<=x) and (?=x), but look-aheads or look-behinds
+ should see outside of the target substring
+ [20] need insensitive matching for linguistic features other
+ than case; for example, hiragana to katakana, wide and
+ narrow, simplified Han to traditional Han (see UTR#30
+ "Character Foldings")
=back
The following table is from Unicode 3.2.
- Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
+ Code Points 1st Byte 2nd Byte 3rd Byte 4th Byte
- U+0000..U+007F 00..7F
+ U+0000..U+007F 00..7F
U+0080..U+07FF * C2..DF 80..BF
- U+0800..U+0FFF E0 * A0..BF 80..BF
+ U+0800..U+0FFF E0 * A0..BF 80..BF
U+1000..U+CFFF E1..EC 80..BF 80..BF
U+D000..U+D7FF ED 80..9F 80..BF
U+D800..U+DFFF +++++++ utf16 surrogates, not legal utf8 +++++++
U+E000..U+FFFF EE..EF 80..BF 80..BF
- U+10000..U+3FFFF F0 * 90..BF 80..BF 80..BF
- U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
- U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
+ U+10000..U+3FFFF F0 * 90..BF 80..BF 80..BF
+ U+40000..U+FFFFF F1..F3 80..BF 80..BF 80..BF
+ U+100000..U+10FFFF F4 80..8F 80..BF 80..BF
Note the gaps before several of the byte entries above marked by '*'. These are
caused by legal UTF-8 avoiding non-shortest encodings: it is technically
surrogates> are the range C<U+D800..U+DBFF> and the I<low surrogates>
are the range C<U+DC00..U+DFFF>. The surrogate encoding is
- $hi = ($uni - 0x10000) / 0x400 + 0xD800;
- $lo = ($uni - 0x10000) % 0x400 + 0xDC00;
+ $hi = ($uni - 0x10000) / 0x400 + 0xD800;
+ $lo = ($uni - 0x10000) % 0x400 + 0xDC00;
and the decoding is
- $uni = 0x10000 + ($hi - 0xD800) * 0x400 + ($lo - 0xDC00);
+ $uni = 0x10000 + ($hi - 0xD800) * 0x400 + ($lo - 0xDC00);
If you try to generate surrogates (for example by using chr()), you
will get a warning, if warnings are turned on, because those code
Perl's internal representation like so:
sub my_escape_html ($) {
- my($what) = shift;
- return unless defined $what;
- Encode::decode_utf8(Foo::Bar::escape_html(Encode::encode_utf8($what)));
+ my($what) = shift;
+ return unless defined $what;
+ Encode::decode_utf8(Foo::Bar::escape_html(
+ Encode::encode_utf8($what)));
}
Sometimes, when the extension does not convert data but just stores
that is still true.
sub fetchrow {
- my($self, $sth, $what) = @_; # $what is one of fetchrow_{array,hashref}
+ # $what is one of fetchrow_{array,hashref}
+ my($self, $sth, $what) = @_;
if ($] < 5.007) {
return $sth->$what;
} else {
my $ret = $sth->$what;
if (ref $ret) {
for my $k (keys %$ret) {
- defined && /[^\000-\177]/ && Encode::_utf8_on($_) for $ret->{$k};
+ defined
+ && /[^\000-\177]/
+ && Encode::_utf8_on($_) for $ret->{$k};
}
return $ret;
} else {
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