swiftで指定位置の文字を置換。
var str:NSString = "ABCDEFGHIJKLMNOP"
var pos = NSMakeRange(4,4) // 位置
println(str.stringByReplacingCharactersInRange(pos, withString: "hoge"))
NSString型でないとエラーになってしまいますのでご注意を。
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