[Gambas-user] Find files without extensions using LIKE

[Benoît Minisini]

Le 17/10/2017 à 23:11, Tobias Boege a écrit :
> On Tue, 17 Oct 2017, Benoît Minisini wrote:
>> Le 17/10/2017 à 22:28, Moviga Technologies a écrit :
>>> Hi!
>>>
>>> Is it possible to get all files without extensions using Dir()?
>>>
>>> This does not work: *[^.]*
>>>
>>>
>>
>> Of course, as the "*" will match any point in the file name.
>>
>> The native regexp syntax cannot express that, you have to filter the result
>> of Dir() "by hand".
>>
>> As Dir() takes an integer option, I can add a new option that tells to
>> return files that -do not- match the pattern. That way you will be able to
>> do something like:
>>
>> Dir(Directory, "*.*", gb.InvertMatch)
>>
>> But I don't really like that solution.
>>
>> The better would be enhancing the regexp syntax, but it's almost impossible
>> without breaking backward-compatibility.
>>
>> Not simple...
>>
> 
> Gambas has something that looks like built-in PCRE with the MATCH keyword.
> You could leave LIKE alone until Gambas 4 by introducing a gb.Match flag,
> which replaces the invocation of LIKE by MATCH. This looks like a sound
> way to handle it: both are matching operators, the faster one is the default
> but you can choose the more powerful one if you need it. In this case,
> the new flag is much more versatile than a gb.InvertMatch, if that's why
> you didn't like it.
> 
> There are other places where this constant could be used, for example the
> Mode argument to String[].Find(), which already understands gb.Like.
> 
> Regards,
> Tobi
> 

Clever. But I still do not drop the possibility to enhance "LIKE" a bit, 
as it should take far less memory than pcre, and be faster in simple 
case. But I never checked!

-- 
Benoît Minisini