使用“，”和“。”作为分数分隔符将字符串解析为浮点数的最佳方法是什么？ （数字<5）

This is kind of related to my previous question, but not really. I have an input of which I don't know the culture. So it can both use ',' and '.' as separator for the fraction. The number will never be >5 though, so we can be rather sure if there's a separator, it will be for the fraction. question