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Subject: bug#57507: Regular expression matching depends on locale encoding
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Regular expressions do funky things with Unicode if a non-Unicode-aware
locale is set. Yet, they're purely string operations, so I don't think
it's expected that they depend on the locale encoding.



$ LC_ALL=C guile3.0
GNU Guile 3.0.7
Copyright (C) 1995-2021 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(guile-user)> (use-modules (ice-9 regex))
scheme@(guile-user)> (match:substring (string-match "\u203f" "\u3091"))
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure make-regexp: Invalid preceding regular expression

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
scheme@(guile-user) [1]> ,q
scheme@(guile-user)> (match:substring (string-match "[\u203f]" "\u3091"))
$1 = "\u3091"
scheme@(guile-user)>

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To: Jean Abou Samra <jean@HIDDEN>
Subject: bug#57507: Acknowledgement (Regular expression matching depends
 on locale encoding)
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Subject: bug#57507: Regular expression matching depends on locale encoding
References: <dba30c62-7ac8-21ea-0a79-6a22bb108284@HIDDEN>
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=0AAlso remember that Guile uses the system C library regex routines. An=
d=0Ais using C strings, not Guile strings.=0A=0A(sorry for top post, too=
 tired to fight with this web editor)=0A=0A-Dale=0A=0A=09---------------=
--------------------------From: "Jean Abou Samra" =0ATo: 57507@HIDDEN=
nu.org=0ACc: =0ASent: Wednesday August 31 2022 12:55:13PM=0ASubject: bug=
#57507: Regular expression matching depends on locale=0Aencoding=0A=0A R=
egular expressions do funky things with Unicode if a=0Anon-Unicode-aware=
=0A locale is set. Yet, they're purely string operations, so I don't=0At=
hink=0A it's expected that they depend on the locale encoding.=0A=0A $ L=
C_ALL=3DC guile3.0=0A GNU Guile 3.0.7=0A Copyright (C) 1995-2021 Free So=
ftware Foundation, Inc.=0A=0A Guile comes with ABSOLUTELY NO WARRANTY; f=
or details type `,show w'.=0A This program is free software, and you are=
 welcome to redistribute it=0A under certain conditions; type `,show c'=
 for details.=0A=0A Enter `,help' for help.=0A scheme@(guile-user)> (use=
-modules (ice-9 regex))=0A scheme@(guile-user)> (match:substring (string=
-match "u203f" "u3091"))=0A ice-9/boot-9.scm:1685:16: In procedure raise=
-exception:=0A In procedure make-regexp: Invalid preceding regular expre=
ssion=0A=0A Entering a new prompt. Type `,bt' for a backtrace or `,q' to=
=0Acontinue.=0A scheme@(guile-user) [1]> ,q=0A scheme@(guile-user)> (mat=
ch:substring (string-match "[u203f]"=0A"u3091"))=0A $1 =3D "u3091"=0A sc=
heme@(guile-user)>=0A=0A

--=_cf6e2bbb45a9e4a4389f62f4f3ba8a83
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<html><body><br>Also remember that Guile uses the system C library regex=
 routines.&nbsp; And is using C strings, not Guile strings.<br><br>(sorr=
y for top post, too tired to fight with this web editor)<br><br>-Dale<br=
><div class=3D"reply-new-signature"></div><p>---------------------------=
--------------</p>From: "Jean Abou Samra" <jean@HIDDEN><br>To: 57=
507 <at> debbugs.gnu.org<br>Cc: <br>Sent: Wednesday August 31 2022 12:55:13PM=
<br>Subject: bug#57507: Regular expression matching depends on locale en=
coding<br><br>=0ARegular expressions do funky things with Unicode if a=
=0Anon-Unicode-aware<br>=0Alocale is set. Yet, they're purely string ope=
rations, so I don't=0Athink<br>=0Ait's expected that they depend on the=
 locale encoding.<br><br><br><br>=0A$ LC_ALL=3DC guile3.0<br>=0AGNU Guil=
e 3.0.7<br>=0ACopyright (C) 1995-2021 Free Software Foundation, Inc.<br>=
<br>=0AGuile comes with ABSOLUTELY NO WARRANTY; for details type `,show=
=0Aw'.<br>=0AThis program is free software, and you are welcome to redis=
tribute=0Ait<br>=0Aunder certain conditions; type `,show c' for details.=
<br><br>=0AEnter `,help' for help.<br>=0Ascheme@(guile-user)&gt; (use-mo=
dules (ice-9 regex))<br>=0Ascheme@(guile-user)&gt; (match:substring (str=
ing-match "\u203f"=0A"\u3091"))<br>=0Aice-9/boot-9.scm:1685:16: In proce=
dure raise-exception:<br>=0AIn procedure make-regexp: Invalid preceding=
 regular expression<br><br>=0AEntering a new prompt.&nbsp; Type `,bt' fo=
r a backtrace or `,q' to=0Acontinue.<br>=0Ascheme@(guile-user) [1]&gt; ,=
q<br>=0Ascheme@(guile-user)&gt; (match:substring (string-match "[\u203f]=
"=0A"\u3091"))<br>=0A$1 =3D "\u3091"<br>=0Ascheme@(guile-user)&gt;<br><b=
r><br><br><br></jean@HIDDEN></body></html>

--=_cf6e2bbb45a9e4a4389f62f4f3ba8a83--

Message sent to bug-guile@HIDDEN:

Subject: bug#57507: Regular expression matching depends on locale encoding
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Date: Mon, 05 Sep 2022 09:48:36 +0200
In-Reply-To: <dba30c62-7ac8-21ea-0a79-6a22bb108284@HIDDEN> (Jean Abou
 Samra's message of "Wed, 31 Aug 2022 18:54:50 +0200")
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Hi Jean,

Jean Abou Samra <jean@HIDDEN> skribis:

> Regular expressions do funky things with Unicode if a non-Unicode-aware
> locale is set. Yet, they're purely string operations, so I don't think
> it's expected that they depend on the locale encoding.

This is the expected behavior: first because (ice-9 regex) is
implemented in terms of the libc regex functions, as Dale put (but that
could be thought as an implementation detail), and second because things
such as character classes are necessarily locale-dependent (this has
bitten us in the past, for instance with <https://bugs.gnu.org/35785>).

I hope that makes sense.

Thanks,
Ludo=E2=80=99.

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Le 05/09/2022 à 09:48, Ludovic Courtès a écrit :
> Hi Jean,
>
> Jean Abou Samra <jean@HIDDEN> skribis:
>
>> Regular expressions do funky things with Unicode if a non-Unicode-aware
>> locale is set. Yet, they're purely string operations, so I don't think
>> it's expected that they depend on the locale encoding.
> This is the expected behavior: first because (ice-9 regex) is
> implemented in terms of the libc regex functions, as Dale put (but that
> could be thought as an implementation detail), and second because things
> such as character classes are necessarily locale-dependent (this has
> bitten us in the past, for instance with <https://bugs.gnu.org/35785>).
>
> I hope that makes sense.



OK, thanks, but in this case, it should be clearly stated as a limitation
in the (ice-9 regex) documentation IMHO. If you don't know what constraints
there are on the implementation, there is no reason to expect this. Would it
help if I submitted a patch for that?

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Date: Mon, 05 Sep 2022 21:24:35 +0200
In-Reply-To: <a9cd5f37-caef-0554-ad5a-a5f1f7fd7919@HIDDEN> (Jean Abou
 Samra's message of "Mon, 5 Sep 2022 20:39:26 +0200")
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Hi,

Jean Abou Samra <jean@HIDDEN> skribis:

> Le 05/09/2022 =C3=A0 09:48, Ludovic Court=C3=A8s a =C3=A9crit=C2=A0:
>> Hi Jean,
>>
>> Jean Abou Samra <jean@HIDDEN> skribis:
>>
>>> Regular expressions do funky things with Unicode if a non-Unicode-aware
>>> locale is set. Yet, they're purely string operations, so I don't think
>>> it's expected that they depend on the locale encoding.
>> This is the expected behavior: first because (ice-9 regex) is
>> implemented in terms of the libc regex functions, as Dale put (but that
>> could be thought as an implementation detail), and second because things
>> such as character classes are necessarily locale-dependent (this has
>> bitten us in the past, for instance with <https://bugs.gnu.org/35785>).
>>
>> I hope that makes sense.
>
>
>
> OK, thanks, but in this case, it should be clearly stated as a limitation
> in the (ice-9 regex) documentation IMHO. If you don't know what constrain=
ts
> there are on the implementation, there is no reason to expect this. Would=
 it
> help if I submitted a patch for that?

Yes, that=E2=80=99d be welcome.  I would not call it a constraint or limita=
tion;
for example, that =E2=80=98w=E2=80=99 is not a letter in Swedish is the kin=
d of thing
you=E2=80=99d generally want to take into account.  Now, it=E2=80=99d be ni=
ce if one
could easily specify the locale to operate under, with an API similar to
that of (ice-9 i18n) and its first-class locale objects.

Thanks,
Ludo=E2=80=99.

Last modified: Mon, 5 Sep 2022 19:30:02 UTC

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