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Re: error in replace-match: "args out of range"
From: |
PJ Weisberg |
Subject: |
Re: error in replace-match: "args out of range" |
Date: |
Sat, 9 Apr 2011 13:04:59 -0700 |
On 4/9/11, David Kastrup <dak@gnu.org> wrote:
> ken <gebser@mousecar.com> writes:
>
>> On 04/09/2011 02:44 AM PJ Weisberg wrote:
>>> On 4/8/11, ken <gebser@mousecar.com> 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)
Notice that the expression " not" can NEVER match an empty string.
The ? allows it to appear zero times, so the overall expression
matches even though the subexpression doesn't.
-PJ
- Re: error in replace-match: "args out of range", ken, 2011/04/03
- Re: error in replace-match: "args out of range", PJ Weisberg, 2011/04/03
- Re: error in replace-match: "args out of range", ken, 2011/04/04
- Message not available
- Re: error in replace-match: "args out of range", Tim X, 2011/04/04
- Re: error in replace-match: "args out of range", ken, 2011/04/07
- Message not available
- Re: error in replace-match: "args out of range", Tim X, 2011/04/07
- Re: error in replace-match: "args out of range", ken, 2011/04/09
- Re: error in replace-match: "args out of range", PJ Weisberg, 2011/04/09
- Re: error in replace-match: "args out of range", ken, 2011/04/09
- Message not available
- Re: error in replace-match: "args out of range", David Kastrup, 2011/04/09
- Re: error in replace-match: "args out of range",
PJ Weisberg <=
- Re: error in replace-match: "args out of range", Perry Smith, 2011/04/09
Message not available
Message not availableRe: error in replace-match: "args out of range" [SOLVED], Stefan Monnier, 2011/04/09