[debbugs-tracker] bug#12665: closed (regexp fault for closing square bracket within character class)

[GNU bug Tracking System]

Your message dated Thu, 18 Oct 2012 00:54:01 -0400
with message-id <address@hidden>
and subject line Re: bug#12665: regexp fault for closing square bracket within 
character class
has caused the debbugs.gnu.org bug report #12665,
regarding regexp fault for closing square bracket within character class
to be marked as done.

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-- 
12665: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12665
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> --- Begin Message ---
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> Subject: 
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> regexp fault for closing square bracket within character class
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> Date: 
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> Wed, 17 Oct 2012 21:33:58 +0200
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> guile 2.0.5-deb+1-1
> (string-match "[\\[]" "[")
> ===> #("[" (0 . 1))
> (string-match "[\\]]" "]")
> ===> #f
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> --- End Message ---
> --- Begin Message ---
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> Subject: 
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> Re: bug#12665: regexp fault for closing square bracket within	character class
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> Date: 
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> Thu, 18 Oct 2012 00:54:01 -0400
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> User-agent: 
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> Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux)
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> Panicz Maciej Godek <address@hidden> writes:
> > guile 2.0.5-deb+1-1
> > (string-match "[\\[]" "[")
> > ===> #("[" (0 . 1))
> > (string-match "[\\]]" "]")
> > ===> #f
>
> As documented in "Syntax of Regular Expressions" of the Emacs manual
> (to which section 6.15 of the Guile manual refers):
>
>      To include a `]' in a character set, you must make it the first
>      character.  For example, `[]a]' matches `]' or `a'.  To include a
>      `-', write `-' as the first or last character of the set, or put
>      it after a range.  Thus, `[]-]' matches both `]' and `-'.
>
> For example:
>
>   (string-match "[]\\]" "]")   ==>  #("]" (0 . 1))
>
> Note that backslash is also a member of this character class, and of the
> character class in your first example:
>
>   (string-match "[]\\]" "\\")  ==>  #("\\" (0 . 1))
>   (string-match "[\\[]" "\\")  ==>  #("\\" (0 . 1))
>
> You might have been thinking that the backslash would escape the square
> brackets in your class, but that's not how it works within character
> classes.  '[' can be included anywhere in a character class without
> being escaped, and ']' and '-' are handled as described above.
>
>     Regards,
>       Mark
>
>
> --- End Message ---