Issue #5120 has been updated by mame (Yusuke Endoh).

Status changed from Open to Assigned
Assignee set to matz (Yukihiro Matsumoto)
Target version set to 3.0


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Feature #5120: String#split needs to be logical
https://bugs.ruby-lang.org/issues/5120#change-25161

Author: alexeymuranov (Alexey Muranov)
Status: Assigned
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: 
Target version: 3.0


I would call this a bug, but i am new to Ruby, so i report this as a feature request.

Here are examples showing a surprising and inconsistent behavior of String#split method:

"aa".split('a')  # => []
"aab".split('a')  # => ["", "", "b"]

"aaa".split('aa')  # => ["", "a"] 
"aaaa".split('aa')  # => []
"aaaaa".split('aa')  # => ["", "", "a"] 

"".split('')  # => []
"a".split('')  # => ["a"]

What is the definition of *split*?
In my opinion, there should be given a simple one that would make it clear what to expect.
For example:

  str1.split(str2) returns a maximal array of non-empty substrings of str1 which can be concatenated with copies of str2 to form str1.

Additional precisions can be made to this definition to make clear what to expect as the result of "baaab".split("aa").

Thanks for attention.


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