Regular expressions do not support ^start and end$ of input characters?

[Dominykas Mostauskis]

I am having trouble using the ^ and $ characters under Clojurescript. Equivalent calls in Clojure work fine. Workarounds?

Unexpected cljs behaviour:

cljs.user=> (clojure.string/split "123" #"$" 2)
["" "123"]
cljs.user=> (clojure.string/split "123" #"^" 2)
["" "123"]

Clojure works fine:

user=> (clojure.string/split "123" #"$" 2)
["123" ""]
user=> (clojure.string/split "123" #"^" 2)
["123"]

[Francis Avila]

This is an edge case of clojure.string/split with limits and non-consuming assertions. ^ and $ are fully supported with the meaning of the underlying regex engine (which may be subtly different in javascript and java).

This is clearly wrong. It occurs because clojure.string/match uses the size of the match to determine where to split. Since the match is always empty, it always splits at index 0.

cljs.user=> (clojure.string/split "123" #"$" 2)
["" "123"]

However, I'm not sure why you consider Clojure's answers to be correct. I would expect this in Clojure:

user=>(clojure.string/split "123" #"^" 2)
["" "123"]

[Dominykas Mostauskis]

I had the afterthought that my examples were a bit odd. As far as splitting with regex is concerned Clojure and Clojurescript behaviour is significantly different in my experience. In my use case I gave up trying to find regex patterns that would work for both clj and cljs and started writing platform specific patterns. Luckily Clojure 1.7.0 is being rolled out at the moment and it includes Reader Conditionals allowing to write these bilingual libraries easily.

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