# Encoding\_fixed $b$h(b encoding\_none $b$ngq;\_(b

**URL:** <https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391>\
**Category:** Development\
**Created:** [February 15, 2009, 8:17pm UTC](https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391 "2009-02-15T20:17:54Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![NARUSES\_Yui](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/258eb7/32.png) [@NARUSES\_Yui](https://www.ruby-forum.com/u/NARUSES_Yui)\
**Post date:** [February 15, 2009, 8:17pm UTC](https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391/1 "2009-02-15T20:17:54Z")

</div>

e$B@.@%$G$9!#e(B

e$B35MW$O@hF|$^$D$b$H$5$s$KOC$7$^$7$?$,!"e(BRegexp e$B$K$\*$1$kFC\<l$Je(B  
ENCODING\_FIXED e$B$He(B ENCODING\_NONE e$B$N07$$$O0lItITMW$K46$8$^$9!#e(B

Ruby 1.9.1 e$B$K$Oe(B 1.8 e$BF1MM!"e(B  
e$B@55,I=8=%j%F%i%k$Ke(B //s e$B$de(B //n  
e$B$H$$$C$?%\*%W%7%g%s$r;XDj$G$-$^$9!#e(B

e$B$H$3$m$,!"$3$N8z2L$O!"e(B//s e$B$de(B //ee$B!“e(B//u e$B$N\>l9g$O!“e(B  
e$B@55,I=8=$N%(%s%3!\<%G%#%s%0$r;XDj$9$k$@$1$G$J$/!“e(B  
e$B%^%C%ABP\>]$NJ8;zNs$r;XDj$7$?%(%s%3!\<%G%#%s%0$K!V8GDj!W$7$^$9!#e(B  
e$B6qBNE\*$K$Oe(B /aa/u =~ “aa”.force\_encoding(“euc-jp”)  
e$B$,%^%C%A$7$J$/$J$j$^$9!#e(B  
e$B$7$+$7!”$3$N;EMM$O:.Mp$r\>7$/$@$1$GITMW$G$O$J$$$G$7$g$&$+!#e(B  
e$BHse(B ASCII e$BJ8;z$N%A%’%C%/MQ$H$7$F!”@55,I=8=FbIt$Ne(B KCODE\_FIXED  
e$B$Oe(B  
e$B;D$9I,MW$,$”$k$H;W$$$^$9$,!"e(B//s  
e$BEy$+$i;XDj$G$-$k;EMM$N:o=|$rDs0F$7$^$9!#e(B

e$B$^$?!"e(B//n e$B$O!"e(B

1. e$B%(%s%3!\<%G%#%s%0$Ke(B ASCII-8BIT e$B$r;XDje(B
2. e$B@55,I=8=%j%F%i%k$KHse(B ASCII e$BJ8;z$r4^$`$H%(%i!\<e(B
3. /./n =~ "e$B$“e(B” e$BEy$G7Y9p$rI=\<(e(B  
e$B$r9T$$$^$9$,!"e(B3. e$B$OITMW$G$O$J$$$G$7$g$&$+!#e(B

# Index: re.c

— re.c (revision 22332)  
+++ re.c (working copy)  
@@ -238,7 +238,6 @@ rb\_memsearch(const void \*x0, long m, const void \*y  
}

#define REG\_LITERAL FL\_USER5  
-#define REG\_ENCODING\_NONE FL\_USER6

#define KCODE\_FIXED FL\_USER4

@@ -302,7 +301,6 @@ rb\_char\_to\_option\_kcode(int c, int \*option, int \*k  
\*kcode = -1;  
return (\*option = char\_to\_option©);  
}

- \*option = ARG\_ENCODING\_FIXED;  
return 1;  
}

@@ -1201,12 +1199,6 @@ rb\_reg\_prepare\_enc(VALUE re, VALUE str, int warn)  
}  
enc = RREGEXP(re)-\>ptr-\>enc;  
}

- if (warn && (RBASIC(re)-\>flags & REG\_ENCODING\_NONE) &&
- enc != rb\_ascii8bit\_encoding() &&
- rb\_enc\_str\_coderange(str) != ENC\_CODERANGE\_7BIT) {
- rb\_warn(“regexp match /…/n against to %s string”,
- rb\_enc\_name(enc));
- }  
return enc;  
}

@@ -2329,8 +2321,7 @@ rb\_reg\_initialize(VALUE obj, const char \*s, int le  
return -1;

```
 if (fixed_enc) {

```

- if ((fixed\_enc != enc && (options & ARG\_ENCODING\_FIXED)) ||
- 

```
       (fixed_enc != a_enc && (options & ARG_ENCODING_NONE))) {

```

- if (fixed\_enc != enc && (options & ARG\_ENCODING\_FIXED)) {  
errcpy(err, “incompatible character encoding”);  
return -1;  
}  
@@ -2347,9 +2338,6 @@ rb\_reg\_initialize(VALUE obj, const char \*s, int le  
if ((options & ARG\_ENCODING\_FIXED) || fixed\_enc) {  
re-\>basic.flags |= KCODE\_FIXED;  
}

- if (options & ARG\_ENCODING\_NONE) {

- 

```
   re->basic.flags |= REG_ENCODING_NONE;

```

- }

- if (RBASIC(re)-\>flags & REG\_ENCODING\_NONE) options |=  
ARG\_ENCODING\_NONE;  
return options;  
}

# Index: test/ruby/test\_m17n.rb

— test/ruby/test\_m17n.rb (revision 22332)  
+++ test/ruby/test\_m17n.rb (working copy)  
@@ -349,24 +349,14 @@ class TestM17N \< Test::Unit::TestCase  
def test\_regexp\_ascii\_none  
r = /a/n

- assert\_warning(%r{regexp match /…/n against to}) {
- 

```
 assert_regexp_generic_ascii(r)

```

- }
- assert\_equal(0, r =~ a(“a”))  
assert\_equal(0, r =~ e(“a”))  
assert\_equal(0, r =~ s(“a”))  
assert\_equal(0, r =~ u(“a”))  
assert\_equal(nil, r =~ a("\xc2\xa1"))
- assert\_warning(%r{regexp match /…/n against to EUC-JP string}) {
- 

```
 assert_equal(nil, r =~ e("\xc2\xa1"))

```

- }
- assert\_warning(%r{regexp match /…/n against to Windows-31J  
string}) {
- 

```
 assert_equal(nil, r =~ s("\xc2\xa1"))

```

- }
- assert\_warning(%r{regexp match /…/n against to UTF-8 string}) {
- 

```
 assert_equal(nil, r =~ u("\xc2\xa1"))

```

- }

- assert\_equal(nil, r =~ e("\xc2\xa1"))

- assert\_equal(nil, r =~ s("\xc2\xa1"))

- assert\_equal(nil, r =~ u("\xc2\xa1"))

def test\_regexp\_euc

- assert\_regexp\_fixed\_eucjp(/a/e)

- assert\_regexp\_generic\_ascii(/a/e)  
assert\_regexp\_fixed\_eucjp(/\xc2\xa1/e)  
assert\_regexp\_fixed\_eucjp(eval(e(%{/\xc2\xa1/})))  
assert\_regexp\_fixed\_eucjp(eval(e(%q{/\xc2\xa1/})))  
@@ -402,10 +392,10 @@ class TestM17N \< Test::Unit::TestCase  
assert\_equal(0, r =~ e(“a”))  
assert\_equal(0, r =~ s(“a”))  
assert\_equal(0, r =~ u(“a”))

- 

```
 assert_raise(Encoding::CompatibilityError) { r =~ a("\xc2\xa1") }

```

- 

```
 assert_nothing_raised{ r =~ a("\xc2\xa1") }
 assert_equal(nil, r =~ e("\xc2\xa1"))

```

- 

```
 assert_raise(Encoding::CompatibilityError) { r =~ s("\xc2\xa1") }

```

- 

```
 assert_raise(Encoding::CompatibilityError) { r =~ u("\xc2\xa1") }

```

- 

```
 assert_nothing_raised{ r =~ s("\xc2\xa1") }

```

- 

```
 assert_nothing_raised{ r =~ u("\xc2\xa1") }

```

}

[/\xc2\xa1/e, eval(e(%{/\xc2\xa1/})), eval(e(%q{/\xc2\xa1/}))].each  
{|r|  
@@ -421,7 +411,7 @@ class TestM17N \< Test::Unit::TestCase  
end

def test\_regexp\_sjis

- assert\_regexp\_fixed\_sjis(/a/s)

- assert\_regexp\_generic\_ascii(/a/s)  
assert\_regexp\_fixed\_sjis(/\xc2\xa1/s)  
assert\_regexp\_fixed\_sjis(eval(s(%{/\xc2\xa1/})))  
assert\_regexp\_fixed\_sjis(eval(s(%q{/\xc2\xa1/})))  
@@ -598,12 +588,10 @@ class TestM17N \< Test::Unit::TestCase

def test\_union\_1\_regexp  
assert\_regexp\_generic\_ascii(Regexp.union(//))

- assert\_warning(%r{regexp match /…/n against to}) {
- 

```
 assert_regexp_generic_ascii(Regexp.union(//n))

```

- }
- assert\_regexp\_fixed\_eucjp(Regexp.union(//e))
- assert\_regexp\_fixed\_sjis(Regexp.union(//s))
- assert\_regexp\_fixed\_utf8(Regexp.union(//u))

- assert\_regexp\_generic\_ascii(Regexp.union(//n))
- assert\_regexp\_generic\_ascii(Regexp.union(//e))
- assert\_regexp\_generic\_ascii(Regexp.union(//s))
- assert\_regexp\_generic\_ascii(Regexp.union(//u))  
end

def test\_union\_2  
@@ -641,16 +629,14 @@ class TestM17N \< Test::Unit::TestCase  
end

def test\_dynamic\_ascii\_regexp

- assert\_warning(%r{regexp match /…/n against to}) {
- 

```
 assert_regexp_generic_ascii(/#{}/n)

```

- }

- assert\_regexp\_generic\_ascii(/#{}/n)  
assert\_regexp\_fixed\_ascii8bit(/#{}\xc2\xa1/n)  
assert\_regexp\_fixed\_ascii8bit(/\xc2\xa1#{}/n)  
assert\_nothing\_raised { s1, s2 = a(’\xc2’), a(’\xa1’); /#{s1}#{s2}/  
}  
end

def test\_dynamic\_eucjp\_regexp

- assert\_regexp\_fixed\_eucjp(/#{}/e)

- assert\_regexp\_generic\_ascii(/#{}/e)  
assert\_regexp\_fixed\_eucjp(/#{}\xc2\xa1/e)  
assert\_regexp\_fixed\_eucjp(/\xc2\xa1#{}/e)  
assert\_raise(SyntaxError) { eval(’/\xc2#{}/e’) }  
@@ -660,7 +646,7 @@ class TestM17N \< Test::Unit::TestCase  
end

def test\_dynamic\_sjis\_regexp

- assert\_regexp\_fixed\_sjis(/#{}/s)

- assert\_regexp\_generic\_ascii(/#{}/s)  
assert\_regexp\_fixed\_sjis(/#{}\xc2\xa1/s)  
assert\_regexp\_fixed\_sjis(/\xc2\xa1#{}/s)  
assert\_raise(SyntaxError) { eval(’/\x81#{}/s’) }  
@@ -670,7 +656,7 @@ class TestM17N \< Test::Unit::TestCase  
end

def test\_dynamic\_utf8\_regexp

- assert\_regexp\_fixed\_utf8(/#{}/u)

- assert\_regexp\_generic\_ascii(/#{}/u)  
assert\_regexp\_fixed\_utf8(/#{}\xc2\xa1/u)  
assert\_regexp\_fixed\_utf8(/\xc2\xa1#{}/u)  
assert\_raise(SyntaxError) { eval(’/\xc2#{}/u’) }

---

<div class="post-metadata">

**Author:** ![NARUSES\_Yui](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/258eb7/32.png) [@NARUSES\_Yui](https://www.ruby-forum.com/u/NARUSES_Yui)\
**Post date:** [February 16, 2009, 10:57am UTC](https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391/2 "2009-02-16T10:57:26Z")

</div>

In article [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid),  
“NARUSE, Yui” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

> e$B$H$3$m$,!"$3$N8z2L$O!"e(B//s e$B$de(B //ee$B!"e(B//u e$B$N\>l9g$O!"e(B  
> e$B@55,I=8=$N%(%s%3!\<%G%#%s%0$r;XDj$9$k$@$1$G$J$/!“e(B  
> e$B%^%C%ABP\>]$NJ8;zNs$r;XDj$7$?%(%s%3!\<%G%#%s%0$K!V8GDj!W$7$^$9!#e(B  
> e$B6qBNE\*$K$Oe(B /aa/u =~ “aa”.force\_encoding(“euc-jp”) e$B$,%^%C%A$7$J$/$J$j$^$9!#e(B  
> e$B$7$+$7!”$3$N;EMM$O:.Mp$r\>7$/$@$1$GITMW$G$O$J$$$G$7$g$&$+!#e(B

e$B\<j85$G$O%^%C%A$7$^$9!#e(B

% ruby-1.9.1p0 -ve ‘p(/aa/u =~ “aa”.force\_encoding(“euc-jp”))’  
ruby 1.9.1p0 (2009-01-30 revision 21907) [i686-linux]  
0

e$B$3$3$G$$$&:.Mp$H$O\<B:]$K$O$J$s$G$7$g$&$+!#e(B

---

<div class="post-metadata">

**Author:** ![NARUSES\_Yui](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/258eb7/32.png) [@NARUSES\_Yui](https://www.ruby-forum.com/u/NARUSES_Yui)\
**Post date:** [February 16, 2009, 12:56pm UTC](https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391/3 "2009-02-16T12:56:13Z")

</div>

e$B@.@%$G$9!#e(B

Tanaka A. wrote:

> % ruby-1.9.1p0 -ve ‘p(/aa/u =~ “aa”.force\_encoding(“euc-jp”))’  
> ruby 1.9.1p0 (2009-01-30 revision 21907) [i686-linux]  
> 0

e$B$\*$C$H!"\<:Ni!#e(B  
% ruby\_1\_9\_1 -ve ‘p(/aa/u =~ "aae$B$“e(B”.encode(“euc-jp”))’  
ruby 1.9.1p0 (2009-02-13 revision 22266) [x86\_64-freebsd7.1]  
-e:1:in `’: incompatible encoding regexp match (UTF-8 regexp with  
EUC-JP string) (Encoding::CompatibilityError)  
e$B$3$C$A$G$9!#e(B

> e$B$3$3$G$$$&:.Mp$H$O\<B:]$K$O$J$s$G$7$g$&$+!#e(B

e$B0J\>e$@$1$J$i0l8+!V;EMM!W$K$b8+$($k$N$G$9$,!"e(B  
e$B$3$N$h$&$J!"e(BRegexp#source.ascii\_only? e$B$,@.N)$9$k$N$K!"e(B  
ASCII  
e$B8\_49$J%(%s%3!\<%G%#%s%0$r;}$DJ8;zNs$K%^%C%A$5$;$k$3$H$,$G$-$J$$e(B  
(Regexp#fixed\_encoding? e$B$,e(B true e$B$Je(B) e$B@55,I=8=$Oe(B //u,  
//s, //e e$B$rMQ$$$F$7$+e(B  
e$B:n$k$3$H$,$G$-$J$$$H$$$&E@$G$9!#e(B

e$B$=$N$h$&$J;EMM$K$9$k$KB-$kM}M3$,$"$k$J$i$P!"$=$N$h$&$K$9$k$N$b$$$$$N$G$7$g$&$,!"e(B  
e$B$o$?$7$K$O$J$$$h$&$K;W$($^$9!#e(B

---

<div class="post-metadata">

**Author:** ![NARUSES\_Yui](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/258eb7/32.png) [@NARUSES\_Yui](https://www.ruby-forum.com/u/NARUSES_Yui)\
**Post date:** [February 16, 2009, 1:15pm UTC](https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391/4 "2009-02-16T13:15:04Z")

</div>

In article [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid),  
“NARUSE, Yui” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

> e$B0J\>e$@$1$J$i0l8+!V;EMM!W$K$b8+$($k$N$G$9$,!"e(B  
> e$B$3$N$h$&$J!"e(BRegexp#source.ascii\_only? e$B$,@.N)$9$k$N$K!"e(B  
> ASCII e$B8\_49$J%(%s%3!\<%G%#%s%0$r;}$DJ8;zNs$K%^%C%A$5$;$k$3$H$,$G$-$J$$e(B  
> (Regexp#fixed\_encoding? e$B$,e(B true e$B$Je(B) e$B@55,I=8=$Oe(B //u, //s, //e e$B$rMQ$$$F$7$+e(B  
> e$B:n$k$3$H$,$G$-$J$$$H$$$&E@$G$9!#e(B

Regexp#source.ascii\_only? e$B$,@.N)$7!"e(B  
Regexp#fixed\_encoding? e$B$,e(B true e$B@55,I=8=$re(B  
//u, //s, //e e$B$rMQ$$$:$K:n$kNc$O$?$H$($P0J2\<$,B8:\_$7$^$9!#e(B

% ruby -ve ’  
r = /\u3042/  
p r.source.ascii\_only?  
p r.fixed\_encoding?  
’  
ruby 1.9.2dev (2009-02-15 trunk 22328) [i686-linux]  
true  
true

e$B$3$3$OHyL/$J$H$3$m$G!“@55,I=8=$,5-=R$KMQ$$$?%(%s%3!\<%G%#%s%0e(B  
e$B$H!”$=$l$,%^%C%A$9$kBP\>]$N%(%s%3!\<%G%#%s%0$K$O!“$A$g$C$H%.%c%Ce(B  
e$B%W$,$”$j$^$9!#$3$3$r$$$8$k$K$O!“$=$N%.%c%C%W$K$D$$$F=\<J,$K9Me(B  
e$B$($kI,MW$,$”$j$^$9!#e(B

e$B$H$O$$$(!“@.@%$5$s$,46$8$?:.Mp\<+BN$O!”$J$s$i$+$NLdBj$r\<($7$Fe(B  
e$B$$$k2DG=@-$O=\<J,$K$"$j$^$9!#e(B

e$B$b$&0l2s!“2?$,LdBj$J$N$+$r@53N$KI=8=$7$F$$$?$@$1$k$H$”$j$,$?e(B  
e$B$$$G$9!#e(B

---

<div class="post-metadata">

**Author:** ![NARUSES\_Yui](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/258eb7/32.png) [@NARUSES\_Yui](https://www.ruby-forum.com/u/NARUSES_Yui)\
**Post date:** [February 18, 2009, 12:55am UTC](https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391/5 "2009-02-18T00:55:40Z")

</div>

e$B@.@%$G$9!#e(B

Tanaka A. wrote:

> Regexp#fixed\_encoding? e$B$,e(B true e$B@55,I=8=$re(B  
> //u, //s, //e e$B$rMQ$$$:$K:n$kNc$O$?$H$($P0J2\<$,B8:\_$7$^$9!#e(B
> 
> % ruby -ve ’  
> r = /\u3042/  
> p r.source.ascii\_only?  
> p r.fixed\_encoding?  
> ’  
> ruby 1.9.2dev (2009-02-15 trunk 22328) [i686-linux]  
> true  
> true

e$B$`!"3N$+$K%(%9%1!\<%W$7$FKd$a9~$s$@\>l9g$b$=$&$G$9$M!#e(B  
e$B$9$k$H!"e(BRegexp#source.ascii\_only? e$B$r=P$7$?$N$OITE,@Z$G$7$?!#e(B

> e$B$3$3$OHyL/$J$H$3$m$G!"@55,I=8=$,5-=R$KMQ$$$?%(%s%3!\<%G%#%s%0e(B  
> e$B$H!"$=$l$,%^%C%A$9$kBP\>]$N%(%s%3!\<%G%#%s%0$K$O!"$A$g$C$H%.%c%Ce(B  
> e$B%W$,$"$j$^$9!#$3$3$r$$$8$k$K$O!"$=$N%.%c%C%W$K$D$$$F=\<J,$K9Me(B  
> e$B$($kI,MW$,$"$j$^$9!#e(B

e$B$U$`!“0lHL$K8@$($P3N$+$K6D$k$H$\*$j$G$9!#e(B  
\p e$BEy$N$3$H$b;kLn$KF~$l$l$P!”==J,$J8!F$$,I,MW$G$7$g$&!#e(B

e$BC\<E\*$K8@$($P!"$=$N@55,I=8=$N5-=R$KMQ$$$?%(%s%3!\<%G%#%s%0$HF1$8e(B  
e$B%(%s%3!\<%G%#%s%0$NJ8;zNs$N;~$K%^%C%A$G$-$kHO0O$H!“e(B  
e$B0UL#E\*$K35$MF1$8$K$J$k$h$&$K$7$?$$$G$9$+$M!#e(B  
e$B!V35$M!W$HF~$l$?$N$Oe(B \s e$B$de(B \we$B!”@h$K$Oe(B \p{Hiragana}  
e$BEy$r9M$($F$$$k$o$1$G$9$,!#e(B

> e$B$H$O$$$(!"@.@%$5$s$,46$8$?:.Mp\<+BN$O!"$J$s$i$+$NLdBj$r\<($7$Fe(B  
> e$B$$$k2DG=@-$O=\<J,$K$"$j$^$9!#e(B
> 
> e$B$b$&0l2s!“2?$,LdBj$J$N$+$r@53N$KI=8=$7$F$$$?$@$1$k$H$”$j$,$?e(B  
> e$B$$$G$9!#e(B

e$B$7$+$7!"e(B//u e$BEy$K8B$C$F8@$($P$=$N$h$&$JBg$-$JLdBj$G$O$J$/!"e(B  
/a/u e$B$HF1$8$3$H$r$G$-$kJ}K!$,B8:\_$;$:!“e(BUTF-8, EUC-JP, Windows-31J  
e$B$Ne(B  
3 e$B$D$N%(%s%3!\<%G%#%s%0$G$7$+;H$($J$$FC\<l$J5!G=$G$”$kE@$+$i!"e(B  
e$B6ICOE\*$JLdBj$@$H;W$C$F$$$^$9!#e(B

e$B$=$7$F$^$:!"D\>@\E\*$JLdBj$H$7$F$O!"Nc$($P!"e(B

> Regexp.new(/a/u.source) == /a/u  
> =\> false  
> e$B$H!“e(BRegexp#source e$B$He(B Regexp#new  
> e$B$GLa$i$J$$E@$,$”$j$^$9!#e(B

e$B$^$?!"0lHL$K@55,I=8=$O0lEY:n$C$F$7$^$&$H!"e(B  
e$B$=$l$,$J$\<e(B fixed\_encoding e$B$J$N$+8e$+$iCN$k$3$H$O:$Fq$G$9!#e(B  
e$B$?$$$F$$$N\>l9g$Oe(B

- ASCII e$B8\_49%(%s%3!\<%G%#%s%0$G$J$$$+$ie(B
- e$B@55,I=8=$KHse(B ASCII  
e$B$r\<($9%j%F%i%k$^$?$O%(%9%1!\<%W$r4^$`$+$ie(B
- \p e$BEy$r4^$`$+$ie(B  
e$B$G!"$3$l$i$O$=$l$J$j$KM}M3$,$"$j$^$9!#e(B(e$B%W%m%Q%F%#Ey$O\>-MhE\*$K8!F$$,I,MW$G$7$g$&e(B)  
e$B$7$+$7e(B //u e$B$O$=$&$7$?@55,I=8=$=$N$b$N$rL5;k$7$Fe(B KCODE\_FIXED  
e$B$rIUM?$7$^$9!#e(B

e$B$o$?$7$Oe(B //u  
e$B5-K!\<+BN$NGQ;_$O\<gD%$7$F$$$J$$$N$G!"$3$l$,1F6A$9$k$N$O!"e(B  
/a/u e$B$de(B /\w/u e$B$rHse(B ASCII  
e$B$JJ8;z$r4^$`\>l9g$J$N$G$3$l$i$K$D$$$F9M$($k$H!"e(B  
/a/u e$B$Oe(B UTF-8  
e$B$K$\*$1$k!Ve(Bae$B!W$rB\>$N%(%s%3!\<%G%#%s%0$N!Ve(Bae$B!W$H6hJL$7!"e(B  
UTF-8 e$B$N$b$N$N$_$K%^%C%A$5$;$k@55,I=8=$H9M$($i$l$^$9!#e(B  
e$B$7$+$7!"$=$N$h$&$J5!G=$OI,MW$G$7$g$&$+!#e(B  
e$B$o$?$7$OI,MW$J$$$H;W$$$^$9$7!"$b$7I,MW$J$i$PB\>$N%(%s%3!\<%G%#%s%0$K$bDs6!$9$k$Y$-$G$9!#e(B  
/\w/u e$B$K$D$$$F$bF1MM$K46$8$^$9!#e(B

e$B$=$7$F!"$9$G$Ke(B 1.8 e$BMQ$K=q$+$l$?e(B /a/u e$BEy$b$o$6$o$6e(B  
UTF-8 e$BEy$K8BDj$9$k0U?^$Oe(B  
e$B$J$+$C$?$N$G$O$J$$$+$H;W$$$^$9!#e(B  
e$B8=\>u!"$G$-$4$3$m$Ge(B /u e$B$rIU$1$F$7$^$C$?@55,I=8=%j%F%i%k$+$i!"e(B  
/u  
e$B$r:o$k$H$$$&ITLS$J:n6H$,9T$o$l$F$$$^$9$,!"K\Ev$K$=$l$OI,MW$J$s$G$7$g$&$+!#e(B  
e$B0UL#O@$+$iI,MW$J:n6H$J$i$P9T$C$FLc$&$Y$-$@$H;W$$$^$9$,!"e(B  
e$B$o$?$7$K$O$=$&$O;W$($^$;$s!#e(B

e$B7k6I$N$H$3$m!"$3$l$OITI,MW$JHsBP\>N$J5!G=$K8+$($^$9!#e(B

---

<div class="post-metadata">

**Author:** ![NARUSES\_Yui](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/258eb7/32.png) [@NARUSES\_Yui](https://www.ruby-forum.com/u/NARUSES_Yui)\
**Post date:** [February 22, 2009, 6:38am UTC](https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391/6 "2009-02-22T06:38:39Z")

</div>

In article [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid),  
“NARUSE, Yui” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

> e$B$7$+$7!"e(B//u e$BEy$K8B$C$F8@$($P$=$N$h$&$JBg$-$JLdBj$G$O$J$/!"e(B  
> /a/u e$B$HF1$8$3$H$r$G$-$kJ}K!$,B8:\_$;$:!“e(BUTF-8, EUC-JP, Windows-31J e$B$Ne(B  
> 3 e$B$D$N%(%s%3!\<%G%#%s%0$G$7$+;H$($J$$FC\<l$J5!G=$G$”$kE@$+$i!"e(B  
> e$B6ICOE\*$JLdBj$@$H;W$C$F$$$^$9!#e(B
> 
> e$B$=$7$F$^$:!"D\>@\E\*$JLdBj$H$7$F$O!"Nc$($P!"e(B
> 
> > Regexp.new(/a/u.source) == /a/u  
> > =\> false  
> > e$B$H!“e(BRegexp#source e$B$He(B Regexp#new e$B$GLa$i$J$$E@$,$”$j$^$9!#e(B

e$BLa$9$?$a$K$Oe(B options e$B$b;XDj$7$F$/$@$5$$!#e(B

r = /a/u  
r2 = Regexp.new(r.source, r.options)  
p r2.fixed\_encoding? #=\> true

options e$B$Oe(B fixed\_encoding e$B$@$1$G$J$/!"e(B//i e$B$J$IB\>$Ne(B  
option e$B$re(B  
e$BJ]B8$9$k$?$a$K$bI,MW$G$9!#e(B

e$B$=$7$F!"$3$l$GLa$k$3$H$+$i$o$+$k$h$&$K!"G$0U$N%(%s%3!\<%G%#%se(B  
e$B%0$Ge(B fixed\_encoding e$B$K$9$k$3$H$b\<B$O2DG=$G$9!#e(B

p Regexp.new(“a”, 16).fixed\_encoding? #=\> true

16 e$B$H$$$&$N$rD\>@=q$/$H$$$&$N$OJQ$G$O$"$j$^$9$,!"e(B  
Regexp::FIXEDENCODING e$B$H$$$&Dj?t$r:n$k$3$H$O4JC1$G$9!#e(B

> /a/u e$B$de(B /\w/u e$B$rHse(B ASCII e$B$JJ8;z$r4^$`\>l9g$J$N$G$3$l$i$K$D$$$F9M$($k$H!"e(B

e$B$9$$$^$;$s!#J8\>O$,$h$/$o$+$j$^$;$s!#e(B

> e$B$7$+$7!“$=$N$h$&$J5!G=$OI,MW$G$7$g$&$+!#e(B  
> e$B$o$?$7$OI,MW$J$$$H;W$$$^$9$7!”$b$7I,MW$J$i$PB\>$N%(%s%3!\<%G%#%s%0$K$bDs6!$9$k$Y$-$G$9!#e(B

e$B8=:\_$bDs6!$7$F$$$J$$$o$1$G$O$"$j$^$;$s!#$^$H$b$KDs6!$9$k$N$be(B  
e$B4JC1$G$9!#e(B

e$B$^$?!"e(B//i e$B$K$D$$$F$O$I$&$G$7$g$&$+!#e(B

/fi/ui e$B$Oe(B “\uFB01” e$B$H%^%C%A$7$^$9!#e(B  
e$B$H$$$&$N$Oe(B U+FB01 e$B$Oe(B fi e$B$N9g;z$@$+$i$G$9$,!"e(B  
/fi/ei e$B$He(B EUC-JP e$B$rL@\<($7$?$H$-$K$be(B “\uFB01”  
e$B$K%^%C%A$9$Y$-e(B  
e$B$J$s$G$7$g$&$+!#e(B

> e$B$=$7$F!"$9$G$Ke(B 1.8 e$BMQ$K=q$+$l$?e(B /a/u e$BEy$b$o$6$o$6e(B UTF-8 e$BEy$K8BDj$9$k0U?^$Oe(B  
> e$B$J$+$C$?$N$G$O$J$$$+$H;W$$$^$9!#e(B

e$B$=$&$O;W$$$^$;$s!#e(B

> e$B8=\>u!"$G$-$4$3$m$Ge(B /u e$B$rIU$1$F$7$^$C$?@55,I=8=%j%F%i%k$+$i!"e(B  
> /u e$B$r:o$k$H$$$&ITLS$J:n6H$,9T$o$l$F$$$^$9$,!"K\Ev$K$=$l$OI,MW$J$s$G$7$g$&$+!#e(B

e$B$3$N:n6H$C$F$I$3$G5/$-$F$k$s$G$9$+e(B?

//n e$B$K$D$$$F$O$?$7$+$K$"$$$^$$$J;H$$$+$?$,B?$+$C$?$H;W$$$^$9!#e(B  
e$B$@$+$i!“7Y9p$K\<e$a$?$N$G$9$,!”$=$l0J30$OL@3N$@$C$?$h$&$K46$8e(B  
e$B$F$$$^$9!#e(B

---

<div class="post-metadata">

**Author:** ![NARUSES\_Yui](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/258eb7/32.png) [@NARUSES\_Yui](https://www.ruby-forum.com/u/NARUSES_Yui)\
**Post date:** [February 28, 2009, 7:32pm UTC](https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391/7 "2009-02-28T19:32:55Z")

</div>

e$B@.@%$G$9!#e(B

Tanaka A. wrote:

> e$B$=$7$F!"$3$l$GLa$k$3$H$+$i$o$+$k$h$&$K!"G$0U$N%(%s%3!\<%G%#%se(B  
> e$B%0$Ge(B fixed\_encoding e$B$K$9$k$3$H$b\<B$O2DG=$G$9!#e(B
> 
> 16 e$B$H$$$&$N$rD\>@=q$/$H$$$&$N$OJQ$G$O$"$j$^$9$,!"e(B  
> Regexp::FIXEDENCODING e$B$H$$$&Dj?t$r:n$k$3$H$O4JC1$G$9!#e(B

e$B$U$`!"$J$k$[$I!#e(B  
e$BJQ$+$I$&$+$h$j$b$3$l$,e(B Ruby 1.9  
e$B$N;EMM$N0lIt$J$N$+$,5$$K$J$j$^$9$,!"e(B  
e$B$$$D$G$b\<BAu2DG=$J$3$H$O$o$+$j$^$7$?!#e(B  
e$BI,MW$J$i$PDj?t$r:n$C$?J}$,$$$$$N$G$7$g$&$M!#e(B

> e$B$^$?!"e(B//i e$B$K$D$$$F$O$I$&$G$7$g$&$+!#e(B
> 
> /fi/ui e$B$Oe(B “\uFB01” e$B$H%^%C%A$7$^$9!#e(B  
> e$B$H$$$&$N$Oe(B U+FB01 e$B$Oe(B fi e$B$N9g;z$@$+$i$G$9$,!"e(B  
> /fi/ei e$B$He(B EUC-JP e$B$rL@\<($7$?$H$-$K$be(B “\uFB01” e$B$K%^%C%A$9$Y$-e(B  
> e$B$J$s$G$7$g$&$+!#e(B

e$B$&!\<$s!"$=$l$C$F%l%$%d!\<$,0c$&$h$&$J5$$,$7$^$9!#e(B

e$BNc$($P!"e(B  
/ss/ui =~ “\u00df”.encode(“iso-8859-1”)  
e$B$O%^%C%A$7$F$b$$$$$H;W$$$^$9$,!"e(B

# Unicode e$B$Ne(B U+0000 e$B$+$ie(B U+00FF e$B$^$G$Oe(B ISO-8859-1

e$B$H0lCW$9$k$O$:$@$7e(B  
ignorecase e$B$N5sF0$K4X$7$F$O%(%s%3!\<%G%#%s%0$H$Oe(B  
e$BJL$N%l%$%d!\<$G=hM}$9$k$Y$-$+$H46$8$^$9!#e(B

# e$B$d$k$+$OJL$H$7$F!"e(BRegexp::IGNORECASE\_COMBINE e$B$r:n$j$D$D!"e(B

# e$B%(%s%3!\<%G%#%s%0$4$H$K%G%U%)%k%H$rJQ$($k$H$+e(B

e$B$A$g$C$H$:$l$^$9$,!"e(B  
/\s/ =~ “\u3000” #=\> 0  
/\s/e =~ “\u3000”.encode(“euc-jp”) #=\> nil  
e$B$H$+!#e(B

> > e$B$=$7$F!"$9$G$Ke(B 1.8 e$BMQ$K=q$+$l$?e(B /a/u e$BEy$b$o$6$o$6e(B UTF-8 e$BEy$K8BDj$9$k0U?^$Oe(B  
> > e$B$J$+$C$?$N$G$O$J$$$+$H;W$$$^$9!#e(B
> 
> e$B$=$&$O;W$$$^$;$s!#e(B

e$BNc$($P0J2\<$N$h$&$K$J$k$o$1$G!"$"$^$j6/$$0UL#$r;}$?$;$k$N$O$I$&$J$s$G$9$+$M$’!#e(B

% ruby\_1\_8 -Ku -e’p /a/s =~ “a\xE3\x81\x82”’  
0  
% ruby\_1\_9\_1 -Ku -e’p /a/s =~ “a\xE3\x81\x82”’  
-e:1:in `’: incompatible encoding regexp match (Windows-31J regexp  
with UTF-8 string) (Encoding::CompatibilityError)

> > e$B8=\>u!"$G$-$4$3$m$Ge(B /u e$B$rIU$1$F$7$^$C$?@55,I=8=%j%F%i%k$+$i!"e(B  
> > /u e$B$r:o$k$H$$$&ITLS$J:n6H$,9T$o$l$F$$$^$9$,!"K\Ev$K$=$l$OI,MW$J$s$G$7$g$&$+!#e(B
> 
> e$B$3$N:n6H$C$F$I$3$G5/$-$F$k$s$G$9$+e(B?
> 
> //n e$B$K$D$$$F$O$?$7$+$K$"$$$^$$$J;H$$$+$?$,B?$+$C$?$H;W$$$^$9!#e(B  
> e$B$@$+$i!“7Y9p$K\<e$a$?$N$G$9$,!”$=$l0J30$OL@3N$@$C$?$h$&$K46$8e(B  
> e$B$F$$$^$9!#e(B

e$B!VL@3N$@$C$?!W;H$$J}$H$O!"Nc$($Pe(B

> /\xB9\xA5/ =~ “\xA5\xB9\xA5\xC8”  
> =\> 1  
> /#{"\xB9\xA5"}/e =~ “\xA5\xB9\xA5\xC8”  
> =\> nil  
> e$B$H$+e(B  
> /#{"\\"}/s =~ “\x95\x5C”  
> =\> nil  
> /#{"\\"}/ =~ “\x95\x5C”  
> =\> 1  
> e$B$G$7$g$&$+!#e(B  
> e$B$I$A$i$b%P%$%H9=B$$K5/0x$9$k8m%^%C%A$rKI$0$?$a$N$b$N$K8+$($^$9!#e(B  
> e$B$3$N\<o$N%P%$%H9=B$$K5/0x$9$k8m%^%C%A$O!“e(BRuby 1.9  
> e$B$G$O$o$6$o$6e(B  
> fixed\_encoding  
> e$B$rIU$1$J$/$F$b2sHr$G$-$k$N$G!”$3$l$NKI;\_$G$OITMW$K;W$($^$9!#e(B

e$BB\>$K2?$+%^%C%ABP\>]$N%(%s%3!\<%G%#%s%0$r9J$j$?$$$h$&$JMxMQNc$C$F$"$j$^$7$?$C$1!#e(B

---

<div class="post-metadata">

**Author:** ![NARUSES\_Yui](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/258eb7/32.png) [@NARUSES\_Yui](https://www.ruby-forum.com/u/NARUSES_Yui)\
**Post date:** [March 3, 2009, 6:12pm UTC](https://www.ruby-forum.com/t/encoding-fixed-b-h-b-encoding-none-b-ngq-b/160391/8 "2009-03-03T18:12:06Z")

</div>

In article [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid),  
“NARUSE, Yui” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

> e$BI,MW$J$i$PDj?t$r:n$C$?J}$,$$$$$N$G$7$g$&$M!#e(B

e$B$b$&:n$C$F$7$^$$$^$7$?!#e(B

> e$B$&!\<$s!"$=$l$C$F%l%$%d!\<$,0c$&$h$&$J5$$,$7$^$9!#e(B
> 
> e$BNc$($P!"e(B  
> /ss/ui =~ “\u00df”.encode(“iso-8859-1”)  
> e$B$O%^%C%A$7$F$b$$$$$H;W$$$^$9$,!"e(B
> 
> # Unicode e$B$Ne(B U+0000 e$B$+$ie(B U+00FF e$B$^$G$Oe(B ISO-8859-1 e$B$H0lCW$9$k$O$:$@$7e(B
> 
> ignorecase e$B$N5sF0$K4X$7$F$O%(%s%3!\<%G%#%s%0$H$Oe(B  
> e$BJL$N%l%$%d!\<$G=hM}$9$k$Y$-$+$H46$8$^$9!#e(B
> 
> # e$B$d$k$+$OJL$H$7$F!"e(BRegexp::IGNORECASE\_COMBINE e$B$r:n$j$D$D!"e(B
> 
> # e$B%(%s%3!\<%G%#%s%0$4$H$K%G%U%)%k%H$rJQ$($k$H$+e(B

e$B%l%$%d$,0c$&$H$$$o$l$F$be(B oniguruma e$B$O%(%s%3!\<%G%#%s%0$N$H$3e(B  
e$B$m$G$d$C$F$^$9$7!#e(B

> e$B$A$g$C$H$:$l$^$9$,!"e(B  
> /\s/ =~ “\u3000” #=\> 0  
> /\s/e =~ “\u3000”.encode(“euc-jp”) #=\> nil  
> e$B$H$+!#e(B

e$B$3$l$b%(%s%3!\<%G%#%s%0$r5$$K$7$J$$$H$$$1$J$$Nc$G$9$M!#e(B

e$B$3$&$$$&Nc$b4^$a$F!“@55,I=8=$N5!G=$K$O%(%s%3!\<%G%#%s%0$r5$$Ke(B  
e$B$9$kI,MW$,$”$k$b$N$,$"$j!"5$$K$9$k@55,I=8=$r=q$$$?$H$-$O=q$$e(B  
e$B$?;~E@$G8GDj$7$F$7$^$&$N$,E,@Z$@$H;W$C$F$$$^$9!#e(B

e$B5$$K$7$J$$$H$-$K$Oe(B //e e$B$8$c$J$/$Fe(B //  
e$B$H=q$1$P$$$$$s$8$c$J$$e(B  
e$B$G$7$g$&$+!#e(B

> e$BNc$($P0J2\<$N$h$&$K$J$k$o$1$G!“$”$^$j6/$$0UL#$r;}$?$;$k$N$O$I$&$J$s$G$9$+$M$'!#e(B
> 
> % ruby\_1\_8 -Ku -e’p /a/s =~ “a\xE3\x81\x82”’  
> 0  
> % ruby\_1\_9\_1 -Ku -e’p /a/s =~ “a\xE3\x81\x82”’  
> -e:1:in `': incompatible encoding regexp match (Windows-31J regexp with UTF-8 string) (Encoding::CompatibilityError)

/a/ e$B$J$i$$$$$+$b$7$l$^$;$s$,!"e(B/fi/i e$B$H$+e(B /ss/i  
e$B$O0U?^$7$F$$e(B  
e$B$J$$F0:n$K$J$k$+$b$7$l$J$$$7$J$!!#e(B

> e$B!VL@3N$@$C$?!W;H$$J}$H$O!"Nc$($Pe(B

e$B;d$,46$8$F$$$k$N$O!"e(B//e e$B$Oe(B EUC-JP  
e$B$rA[Dj$7$F$$$k$HM}2r$7$FLde(B  
e$BBj$J$5$=$&$@$H$$$&$3$H$G$9!#e(B

> e$B$I$A$i$b%P%$%H9=B$$K5/0x$9$k8m%^%C%A$rKI$0$?$a$N$b$N$K8+$($^$9!#e(B  
> e$B$3$N\<o$N%P%$%H9=B$$K5/0x$9$k8m%^%C%A$O!“e(BRuby 1.9 e$B$G$O$o$6$o$6e(B  
> fixed\_encoding e$B$rIU$1$J$/$F$b2sHr$G$-$k$N$G!”$3$l$NKI;\_$G$OITMW$K;W$($^$9!#e(B

1.9 e$B$G$OJ8;zNs$,J8;z6-3&$rCN$C$F$$$k$H$$$&$N$O$=$&$G$9$M!#e(B

1.8 e$B$Ne(B /\xB9\xA5/e e$B$O$I$&$J$s$G$9$+$M$'!#\>e$NNc$G$Oe(B #{}  
e$B$GHre(B  
e$B$1$F$^$9$,!#e(B1.9 e$B$G$=$&$7$m$C$F$$$o$l$F$b$G$-$^$;$s$1$l$I!#e(B

> e$BB\>$K2?$+%^%C%ABP\>]$N%(%s%3!\<%G%#%s%0$r9J$j$?$$$h$&$JMxMQNc$C$F$"$j$^$7$?$C$1!#e(B

oniguruma e$B$K$O%(%s%3!\<%G%#%s%0$r5$$K$9$kI,MW$,$“$k5!G=$,$”$je(B  
e$B$^$9$+$i!#e(B