The regular expression for Polish postal codes is [0-9]{2}-?[0-9]{3}, in case you're wondering.
如果您想知道的话，那么告诉您，用于波兰的邮政编码的正则表达式是 [0-9]{2}-? [0-9]{3}。
Evaluate the value of an arithmetic expression in Reverse Polish Notation.
评价一个用逆波兰表示法写成的算法式子的价值。
Evaluate the value of an arithmetic expression in Reverse Polish Notation.
评价一个用逆波兰表示法写成的算法式子的价值。
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