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Re: error in replace-match: "args out of range"


From: David Kastrup
Subject: Re: error in replace-match: "args out of range"
Date: Sat, 09 Apr 2011 14:57:39 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

ken <address@hidden> writes:

> On 04/09/2011 02:44 AM PJ Weisberg wrote:
>> On 4/8/11, ken <address@hidden> wrote:
>>> On 04/07/2011 07:25 PM Tim X wrote:
>>>> This was my point of warning. It is quite possible to have
>>>> regexps where sub expressions are not found, but the overall regexp
>>>> succeeds.
>>> I'm having a hard time with that concept.  Is there a small bit of
>>> example code you could show it with?
>> 
>> "I am\\( not\\)? a fish."
>> 
>> -PJ
>
> And on what sort of string would that RE match but the subexpression
> have the value nil (as opposed to the null string "")?

Huh?  Isn't that rather obvious?

(list (string-match "I am\\( not\\)? a fish." "I am a fish!")
      (match-string 1)) => (0 nil)

-- 
David Kastrup


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