如何代表正则表达式编号范围（例如1到12）？ [英] How to represent regex number ranges (e.g. 1 to 12)?

问题描述

我当前正在使用（[1-9] | 1 [0-2]）表示从1到12的输入。（不允许前导零。）

I'm currently using ([1-9]|1[0-2]) to represent inputs from 1 to 12. (Leading zeros not allowed.)

但是似乎有些 hacky ，在某些情况下，它看起来完全脏。

However it seems rather hacky, and on some days it looks outright dirty.

☞有内置的适当方法吗？

☞还有什么其他方法代表数字范围？

☞ What are some other ways to represent number ranges?

推荐答案

我倾向于使用 [2-9] | 1之类的形式[0-2]？可以避免回溯，尽管在这里没什么区别。尽管regex可以很好地处理XML Schema，但我已经避免了这种歧义。

I tend to go with forms like [2-9]|1[0-2]? which avoids backtracking, though it makes little difference here. I've been conditioned by XML Schema to avoid such "ambiguities", even though regex can handle them fine.

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