Re: Bug in Regex?

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

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 <[hidden email]> 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

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 <[hidden email]> 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 <[hidden email]> 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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