[Pharo-dev] [Glass] Bug in Regex?

Esteban Maringolo emaringolo at gmail.com
Wed Feb 20 15:55:44 EST 2019


What a good case to have GToolkit visualizations help debugging this RX
tree ;)

Regards!


Esteban A. Maringolo


El mié., 20 feb. 2019 a las 17:44, Mariano Martinez Peck via Glass (<
glass at lists.gemtalksystems.com>) escribió:

> And..as Esteban Maringolo points out, it also happens with sequence of
> chars...
>
> 'bb' matchesRegex: '([a-z]|[b-z][a-z])' --> false.
>
> Cannot be simpler than this:
>
> '25' matchesRegex:  '(\d\d|\d)' --> true
> '25' matchesRegex:  '(\d|\d\d)' --> false
>
> So there is something related to the OR.
>
> Thoughts?
>
>
>
> On Wed, Feb 20, 2019 at 5:33 PM Mariano Martinez Peck <
> marianopeck at gmail.com> wrote:
>
>> BTW, I am CCing GemStone mailing list too because it answers false there
>> too.
>>
>> On Wed, Feb 20, 2019 at 5:26 PM Mariano Martinez Peck <
>> marianopeck at gmail.com> wrote:
>>
>>> Hi guys,
>>>
>>> Look at this case:
>>>
>>> `'25' matchesRegex: '([0-9]|[1-9][0-9])' -> false`
>>> `'25' matchesRegex: '([1-9][0-9]|[0-9])' -> true`
>>>
>>> That is, ( a | b ) is not euqal to ( b | a ) " a or b is not equal to b
>>> or a" and should describe a range of 0 to 99.
>>>
>>> I don't understand why the first sentence answers false. Even Pharo 1.1
>>> answers false (so this is very very old behavior). I checked on other
>>> dialects and it answers true. I then checked here [1] and it also find
>>> matches.
>>>
>>> So...do you see some rational explanation or sounds like a bug?
>>>
>>> [1] https://regex101.com/r/MqVXz8/1
>>>
>>> --
>>> Mariano
>>> https://twitter.com/MartinezPeck
>>> http://marianopeck.wordpress.com
>>>
>>
>>
>> --
>> Mariano
>> https://twitter.com/MartinezPeck
>> http://marianopeck.wordpress.com
>>
>
>
> --
> Mariano
> https://twitter.com/MartinezPeck
> http://marianopeck.wordpress.com
> _______________________________________________
> Glass mailing list
> Glass at lists.gemtalksystems.com
> http://lists.gemtalksystems.com/mailman/listinfo/glass
>
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