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Re: Unquoted special characters in regexps
From: |
Andreas Schwab |
Subject: |
Re: Unquoted special characters in regexps |
Date: |
Sun, 26 Feb 2006 14:50:38 +0100 |
User-agent: |
Gnus/5.110003 (No Gnus v0.3) Emacs/22.0.50 (gnu/linux) |
martin rudalics <address@hidden> writes:
> That of closing a character alternative. When you write
>
> (defvar foo "]")
> (defvar bar "\\]")
>
> you can't interchangeably use `foo' and `bar' in an arbitrary regular
> expression. Some people call this "referential transparency".
Of course you can't, since the meaning of '\' is context dependent.
> Anyway, the first `]' has a special meaning but it's not "inside" the
> character alternative.
It is part of it, just like the leading '['.
> It does have a special meaning because `]' is special _outside_
> character alternatives.
This is wrong. Outside of a character set ']' has no special meaning
whatsoever, independent of the context.
> According to the Elisp manual all these exhibit "poor practice" since
> you didn't quote the second `]'s.
It's a bug in the manual.
Andreas.
--
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
- Re: Unquoted special characters in regexps, (continued)
- Re: Unquoted special characters in regexps, Andreas Schwab, 2006/02/25
- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/25
- Re: Unquoted special characters in regexps, Andreas Schwab, 2006/02/25
- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/25
- Re: Unquoted special characters in regexps, Andreas Schwab, 2006/02/25
- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
- Re: Unquoted special characters in regexps, Andreas Schwab, 2006/02/27
- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
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- Re: Unquoted special characters in regexps, Andreas Schwab, 2006/02/25
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- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
- Re: Unquoted special characters in regexps,
Andreas Schwab <=
- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
- Re: Unquoted special characters in regexps, Andreas Schwab, 2006/02/26
- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
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- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/28
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- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
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- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
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- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
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- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
- Message not available
- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26
- Message not available
- Re: Unquoted special characters in regexps, martin rudalics, 2006/02/26