[Seaside] RxParser non standard?

Aaron Rosenzweig aaron at chatnbike.com
Sun Aug 3 13:53:33 UTC 2014


Is there anything newbies should know about Vassili Bykov’s RxParser? It is the de-facto tool for parsing regular expressions in Smalltalk correct? 

Even the “String” class has a utility method that uses it.

Strange for it to be the de-facto standard because… it feels limiting -> see below:

I’m trying to “detect” a url so in this example:


I believe it should work. On my Mac, using “RegExRX” I tested that the expression itself is ok.

In Pharo I get “RegexMatchingError: invalid predicate selector”

When I debug into it a bit more I see:

Character(Object)>>doesNotUnderstand: #'//[-A-Z0-9+&@#/%?=~_|!’

I *assume* it is having trouble with the colons. There is a colon after the “http” part and then one in the first set of []* part right after the exclamation mark… it’s almost like it wants to treat it as if it was one of the convenience constructs like -> [:alpha:] and then obviously chokes because it is not. 

doh! Has anyone run into this before?


*Assuming* that we have to escape every colon when we use the RxParser I modified the code to look like this:


I tested this in RegExRX and it is fine… but in Pharo I at least don’t get an error but I also don’t get any results! Just an empty OrderedCollection. 

Does anyone have any suggestions or am I out of luck? Do I need a different regular expression tool for Smalltalk besides RxParser? Hopefully I’m just making a simple mistake. 

Hopefully I’m the one who is dain bramaged. 

Thanks in advance,
e:  aaron at chatnbike.com  t:  (301) 956-2319 		

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