Re: Lua Suggestion: return nil in string.find/match() for indexes that are before the string

[Coroutines <coroutines@...>]

On Sun, Mar 2, 2014 at 12:20 PM, Coroutines <coroutines@gmail.com> wrote:
> On Sun, Mar 2, 2014 at 12:15 PM, Coroutines <coroutines@gmail.com> wrote:
>> On Sun, Mar 2, 2014 at 12:15 PM, Coroutines <coroutines@gmail.com> wrote:
>>> I think this is what I want: string.at = function (s1, i, s2) return i
>>> == string.find(s1, '^' .. s2, i, true) end
>>>
>>> Again, sorry for all the confusion guys -- I really forgot that
>>> string.find() is expected to search forward from the starting index --
>>> not just *at* the starting index.
>>>
>>> On Sun, Mar 2, 2014 at 12:07 PM, Coroutines <coroutines@gmail.com> wrote:
>>>> On Sun, Mar 2, 2014 at 11:45 AM, Thiago L. <fakedme@gmail.com> wrote:
>>>>>
>>>>> On 02/03/2014 16:40, Dirk Laurie wrote:
>>>>>>
>>>>>> 2014-03-02 21:36 GMT+02:00 Thiago L. <fakedme@gmail.com>:
>>>>>>
>>>>>>> Ok, you want a plain match, same rules apply: it doesn't care about the
>>>>>>> index, it'll just try to find the data, for index -30 and string "cat"
>>>>>>> -30
>>>>>>> would be translated into -27 (because string length - 30) and then it
>>>>>>> would
>>>>>>> still match as "cat" is still on the string (which's 30 chars long with a
>>>>>>> padding of 27 empty spaces on the left).
>>>>>>
>>>>>> This is not what happens. There is no padding to the left. The -27 is
>>>>>> adjusted to be 1.
>>>>>>
>>>>> Yes, I know, but I think it should be changed/fixed...
>>>>>
>>>>
>>>> Hmm.  I did do something screwy here.  I often write a function like
>>>> this: string.at = function (s1, s2, i) return i == string.find(s1, s2,
>>>> i) end
>>>>
>>>> I was misunderstanding the purpose of string.find(), I expected to
>>>> match the needle at the index I give it.  I really don't know how I
>>>> got 3-4 replies in without noticing my err. :\  I should have been
>>>> using my at() function than find(), this entire thread is hooplah.  It
>>>> makes sense that it would reposition the starting index at the
>>>> beginning of the string if it expects to search forward through the
>>>> string/haystack.  Sorry guys, I missed my coffee. :(
>>
>> Forgive me father for I have sinned... it has been 37 seconds since I
>> last top-posted...
>
> I think maybe I'll just call it a day and go read a book or something
> -- final form:
>
> string.at = function (s1, i, s2) return i == string.find(s1, '^' .. s2, i) end

final final final form:  string.at = function (s1, i, s2) if #s1 - i >
0 then return nil end return i == string.find(s1, '^' .. s2, i) end