Is this a bug of String#count?

[Ruohao Li]

$ ruby -v
ruby 1.9.1p429 (2010-07-02 revision 28523) [i386-darwin9]
$ irb --simple-prompt=> 0

Why the above result is 0 not 1? After all there are 2 characters
in the string s. Is this a bug of String#count?

Thanks in advance.
Ruohao

 

[Roger Pack]

s = "a\u4e00"

=> 0

Why the above result is 0 not 1? After all there are 2 characters
in the string s. Is this a bug of String#count?

count returns the sum of occurrences of characters. I don't see any ^a
in the original string...

 

[Ruohao Li]

count returns the sum of occurrences of characters. I don't see any ^a
in the original string...

But according to the documentation, "Any _other_str_ that starts with a
caret (^)
is negated", thus the following behavior:
$ irb --simple-prompt=> 2
There are two characters in s that is *not* "a".

 

[Roger Pack]

But according to the documentation, "Any _other_str_ that starts with a
caret (^)
is negated", thus the following behavior:

Probably because non-ASCII aren't counted as /\w/ matching anymore. You
might want to ping core to see if it is expected or not.