[Pharo-dev] Bug in Regex?

Mariano Martinez Peck marianopeck at gmail.com
Wed Feb 20 15:43:59 EST 2019


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
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