Hi, > I finally found time to further investigate this. Thanks for investigating it.
> Am I doing something wrong? If not, I'll file a ticket. No it's indeed a bug, could you please file a ticket. By the way I've made a shorter version of your code: ------- framework 'Cocoa' s1 = NSMutableString.stringWithString("this is a test script.") s1.sub!(/test/, "あ") puts s1 #=> this is a  ̄チツ script. s2 = NSMutableString.stringWithString("this is a test script.") s2[10..14] = "あ" puts s2 #=> this is a  ̄チツ script. ------- (in fact sub! uses []= internally) Cheers, Vincent
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