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Re: error in replace-match: "args out of range"
From: |
Perry Smith |
Subject: |
Re: error in replace-match: "args out of range" |
Date: |
Sat, 9 Apr 2011 16:25:19 -0500 |
On Apr 9, 2011, at 3:04 PM, PJ Weisberg wrote:
> 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.
Also, "" does not match the subexpression. I don't know but that may be key as
well.
- Re: error in replace-match: "args out of range", (continued)
- 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, 2011/04/09
- Re: error in replace-match: "args out of range",
Perry Smith <=
Message not available
Message not availableRe: error in replace-match: "args out of range" [SOLVED], Stefan Monnier, 2011/04/09